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Finding the Fourth Proportional to 718,382.92, 991,356.48 and 396,122.80

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Solution

The fourth proportional to 718,382.92, 991,356.48 and 396,122.80 is: 546,642.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,382.92 : 991,356.48 = 396,122.80 : x
  2. Step 2: Convert to fraction form
    718,382.92/991,356.48 = 396,122.80/x
  3. Step 3: Cross multiply
    718,382.92x = 991,356.48 × 396,122.80
  4. Step 4: Simplify right side
    718,382.92x = 392,698,904,655.74
  5. Step 5: Solve for x
    x = 392,698,904,655.74/718,382.92
  6. Step 6: Final answer
    x = 546,642.87

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Double scale
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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.