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Finding the Fourth Proportional to 138,443.39, 191,051.88 and 74,781.19

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Solution

The fourth proportional to 138,443.39, 191,051.88 and 74,781.19 is: 103,198.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,443.39 : 191,051.88 = 74,781.19 : x
  2. Step 2: Convert to fraction form
    138,443.39/191,051.88 = 74,781.19/x
  3. Step 3: Cross multiply
    138,443.39x = 191,051.88 × 74,781.19
  4. Step 4: Simplify right side
    138,443.39x = 14,287,086,938.14
  5. Step 5: Solve for x
    x = 14,287,086,938.14/138,443.39
  6. Step 6: Final answer
    x = 103,198.04

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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.