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Finding the Fourth Proportional to 718,757.38, 991,940.88 and 396,495.64

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Solution

The fourth proportional to 718,757.38, 991,940.88 and 396,495.64 is: 547,194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,757.38 : 991,940.88 = 396,495.64 : x
  2. Step 2: Convert to fraction form
    718,757.38/991,940.88 = 396,495.64/x
  3. Step 3: Cross multiply
    718,757.38x = 991,940.88 × 396,495.64
  4. Step 4: Simplify right side
    718,757.38x = 393,300,234,057.76
  5. Step 5: Solve for x
    x = 393,300,234,057.76/718,757.38
  6. Step 6: Final answer
    x = 547,194.71

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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.