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Finding the Fourth Proportional to 415,878.20, 623,817.30 and 389,634.20

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Solution

The fourth proportional to 415,878.20, 623,817.30 and 389,634.20 is: 584,451.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,878.20 : 623,817.30 = 389,634.20 : x
  2. Step 2: Convert to fraction form
    415,878.20/623,817.30 = 389,634.20/x
  3. Step 3: Cross multiply
    415,878.20x = 623,817.30 × 389,634.20
  4. Step 4: Simplify right side
    415,878.20x = 243,060,554,631.66
  5. Step 5: Solve for x
    x = 243,060,554,631.66/415,878.20
  6. Step 6: Final answer
    x = 584,451.30

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Double scale
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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.