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Finding the Fourth Proportional to 138,443.92, 191,052.68 and 74,781.70

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Solution

The fourth proportional to 138,443.92, 191,052.68 and 74,781.70 is: 103,198.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,443.92 : 191,052.68 = 74,781.70 : x
  2. Step 2: Convert to fraction form
    138,443.92/191,052.68 = 74,781.70/x
  3. Step 3: Cross multiply
    138,443.92x = 191,052.68 × 74,781.70
  4. Step 4: Simplify right side
    138,443.92x = 14,287,243,348.42
  5. Step 5: Solve for x
    x = 14,287,243,348.42/138,443.92
  6. Step 6: Final answer
    x = 103,198.78

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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.