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Finding the Fourth Proportional to 718,486.47, 991,488.60 and 396,210.15

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Solution

The fourth proportional to 718,486.47, 991,488.60 and 396,210.15 is: 546,757.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,486.47 : 991,488.60 = 396,210.15 : x
  2. Step 2: Convert to fraction form
    718,486.47/991,488.60 = 396,210.15/x
  3. Step 3: Cross multiply
    718,486.47x = 991,488.60 × 396,210.15
  4. Step 4: Simplify right side
    718,486.47x = 392,837,846,929.29
  5. Step 5: Solve for x
    x = 392,837,846,929.29/718,486.47
  6. Step 6: Final answer
    x = 546,757.47

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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.