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Finding the Fourth Proportional to 391,131.38, 539,761.65 and 212,283.38

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Solution

The fourth proportional to 391,131.38, 539,761.65 and 212,283.38 is: 292,951.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,131.38 : 539,761.65 = 212,283.38 : x
  2. Step 2: Convert to fraction form
    391,131.38/539,761.65 = 212,283.38/x
  3. Step 3: Cross multiply
    391,131.38x = 539,761.65 × 212,283.38
  4. Step 4: Simplify right side
    391,131.38x = 114,582,427,456.38
  5. Step 5: Solve for x
    x = 114,582,427,456.38/391,131.38
  6. Step 6: Final answer
    x = 292,951.25

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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.