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Finding the Fourth Proportional to 138,791.52, 191,532.32 and 75,129.84

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Solution

The fourth proportional to 138,791.52, 191,532.32 and 75,129.84 is: 103,679.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,791.52 : 191,532.32 = 75,129.84 : x
  2. Step 2: Convert to fraction form
    138,791.52/191,532.32 = 75,129.84/x
  3. Step 3: Cross multiply
    138,791.52x = 191,532.32 × 75,129.84
  4. Step 4: Simplify right side
    138,791.52x = 14,389,792,556.43
  5. Step 5: Solve for x
    x = 14,389,792,556.43/138,791.52
  6. Step 6: Final answer
    x = 103,679.19

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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.