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Finding the Fourth Proportional to 129.14, 178.19 and 73.86

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Solution

The fourth proportional to 129.14, 178.19 and 73.86 is: 101.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.14 : 178.19 = 73.86 : x
  2. Step 2: Convert to fraction form
    129.14/178.19 = 73.86/x
  3. Step 3: Cross multiply
    129.14x = 178.19 × 73.86
  4. Step 4: Simplify right side
    129.14x = 13,161.11
  5. Step 5: Solve for x
    x = 13,161.11/129.14
  6. Step 6: Final answer
    x = 101.91

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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.