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Finding the Fourth Proportional to 718,441.74, 991,428.35 and 396,151.74

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Solution

The fourth proportional to 718,441.74, 991,428.35 and 396,151.74 is: 546,677.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,441.74 : 991,428.35 = 396,151.74 : x
  2. Step 2: Convert to fraction form
    718,441.74/991,428.35 = 396,151.74/x
  3. Step 3: Cross multiply
    718,441.74x = 991,428.35 × 396,151.74
  4. Step 4: Simplify right side
    718,441.74x = 392,756,063,957.07
  5. Step 5: Solve for x
    x = 392,756,063,957.07/718,441.74
  6. Step 6: Final answer
    x = 546,677.68

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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.