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Finding the Fourth Proportional to 129.50, 177.30 and 128.24

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Solution

The fourth proportional to 129.50, 177.30 and 128.24 is: 175.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.50 : 177.30 = 128.24 : x
  2. Step 2: Convert to fraction form
    129.50/177.30 = 128.24/x
  3. Step 3: Cross multiply
    129.50x = 177.30 × 128.24
  4. Step 4: Simplify right side
    129.50x = 22,737.73
  5. Step 5: Solve for x
    x = 22,737.73/129.50
  6. Step 6: Final answer
    x = 175.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.