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Finding the Fourth Proportional to 718,938.80, 992,139 and 396,648.88

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Solution

The fourth proportional to 718,938.80, 992,139 and 396,648.88 is: 547,377.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,938.80 : 992,139 = 396,648.88 : x
  2. Step 2: Convert to fraction form
    718,938.80/992,139 = 396,648.88/x
  3. Step 3: Cross multiply
    718,938.80x = 992,139 × 396,648.88
  4. Step 4: Simplify right side
    718,938.80x = 393,530,823,154.32
  5. Step 5: Solve for x
    x = 393,530,823,154.32/718,938.80
  6. Step 6: Final answer
    x = 547,377.36

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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.