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Finding the Fourth Proportional to 129.43, 178.59 and 74.17

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Solution

The fourth proportional to 129.43, 178.59 and 74.17 is: 102.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.43 : 178.59 = 74.17 : x
  2. Step 2: Convert to fraction form
    129.43/178.59 = 74.17/x
  3. Step 3: Cross multiply
    129.43x = 178.59 × 74.17
  4. Step 4: Simplify right side
    129.43x = 13,246.02
  5. Step 5: Solve for x
    x = 13,246.02/129.43
  6. Step 6: Final answer
    x = 102.34

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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.