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Finding the Fourth Proportional to 138,871.26, 191,642.94 and 75,209.13

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Solution

The fourth proportional to 138,871.26, 191,642.94 and 75,209.13 is: 103,788.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,871.26 : 191,642.94 = 75,209.13 : x
  2. Step 2: Convert to fraction form
    138,871.26/191,642.94 = 75,209.13/x
  3. Step 3: Cross multiply
    138,871.26x = 191,642.94 × 75,209.13
  4. Step 4: Simplify right side
    138,871.26x = 14,413,298,788.04
  5. Step 5: Solve for x
    x = 14,413,298,788.04/138,871.26
  6. Step 6: Final answer
    x = 103,788.92

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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.