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Finding the Fourth Proportional to 129.29, 178.43 and 73.29

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Solution

The fourth proportional to 129.29, 178.43 and 73.29 is: 101.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.29 : 178.43 = 73.29 : x
  2. Step 2: Convert to fraction form
    129.29/178.43 = 73.29/x
  3. Step 3: Cross multiply
    129.29x = 178.43 × 73.29
  4. Step 4: Simplify right side
    129.29x = 13,077.13
  5. Step 5: Solve for x
    x = 13,077.13/129.29
  6. Step 6: Final answer
    x = 101.15

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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.