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Finding the Fourth Proportional to 128,407.52, 192,617.20 and 91,134.56

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Solution

The fourth proportional to 128,407.52, 192,617.20 and 91,134.56 is: 136,706.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,407.52 : 192,617.20 = 91,134.56 : x
  2. Step 2: Convert to fraction form
    128,407.52/192,617.20 = 91,134.56/x
  3. Step 3: Cross multiply
    128,407.52x = 192,617.20 × 91,134.56
  4. Step 4: Simplify right side
    128,407.52x = 17,554,083,770.43
  5. Step 5: Solve for x
    x = 17,554,083,770.43/128,407.52
  6. Step 6: Final answer
    x = 136,706.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.