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Finding the Fourth Proportional to 101,924.11, 140,721.80 and 66,215.87

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Solution

The fourth proportional to 101,924.11, 140,721.80 and 66,215.87 is: 91,421.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,924.11 : 140,721.80 = 66,215.87 : x
  2. Step 2: Convert to fraction form
    101,924.11/140,721.80 = 66,215.87/x
  3. Step 3: Cross multiply
    101,924.11x = 140,721.80 × 66,215.87
  4. Step 4: Simplify right side
    101,924.11x = 9,318,016,414.97
  5. Step 5: Solve for x
    x = 9,318,016,414.97/101,924.11
  6. Step 6: Final answer
    x = 91,421.12

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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.