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Finding the Fourth Proportional to 659,878.30, 989,817.45 and 493,990.30

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Solution

The fourth proportional to 659,878.30, 989,817.45 and 493,990.30 is: 740,985.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,878.30 : 989,817.45 = 493,990.30 : x
  2. Step 2: Convert to fraction form
    659,878.30/989,817.45 = 493,990.30/x
  3. Step 3: Cross multiply
    659,878.30x = 989,817.45 × 493,990.30
  4. Step 4: Simplify right side
    659,878.30x = 488,960,219,070.74
  5. Step 5: Solve for x
    x = 488,960,219,070.74/659,878.30
  6. Step 6: Final answer
    x = 740,985.45

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Half scale
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Double scale
Find fourth proportional to 659,879.30, 989,818.95 and 493,991.30
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.