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Finding the Fourth Proportional to 129.53, 178.65 and 82.85

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Solution

The fourth proportional to 129.53, 178.65 and 82.85 is: 114.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.53 : 178.65 = 82.85 : x
  2. Step 2: Convert to fraction form
    129.53/178.65 = 82.85/x
  3. Step 3: Cross multiply
    129.53x = 178.65 × 82.85
  4. Step 4: Simplify right side
    129.53x = 14,800.26
  5. Step 5: Solve for x
    x = 14,800.26/129.53
  6. Step 6: Final answer
    x = 114.26

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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.