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Finding the Fourth Proportional to 487,641.20, 731,461.80 and 408,909.20

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Solution

The fourth proportional to 487,641.20, 731,461.80 and 408,909.20 is: 613,363.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,641.20 : 731,461.80 = 408,909.20 : x
  2. Step 2: Convert to fraction form
    487,641.20/731,461.80 = 408,909.20/x
  3. Step 3: Cross multiply
    487,641.20x = 731,461.80 × 408,909.20
  4. Step 4: Simplify right side
    487,641.20x = 299,101,459,468.56
  5. Step 5: Solve for x
    x = 299,101,459,468.56/487,641.20
  6. Step 6: Final answer
    x = 613,363.80

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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.