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Finding the Fourth Proportional to 717,461.80, 990,103.98 and 395,173.08

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Solution

The fourth proportional to 717,461.80, 990,103.98 and 395,173.08 is: 545,342.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,461.80 : 990,103.98 = 395,173.08 : x
  2. Step 2: Convert to fraction form
    717,461.80/990,103.98 = 395,173.08/x
  3. Step 3: Cross multiply
    717,461.80x = 990,103.98 × 395,173.08
  4. Step 4: Simplify right side
    717,461.80x = 391,262,439,296.86
  5. Step 5: Solve for x
    x = 391,262,439,296.86/717,461.80
  6. Step 6: Final answer
    x = 545,342.54

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.