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Finding the Fourth Proportional to 128.68, 175.25 and 127.17

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Solution

The fourth proportional to 128.68, 175.25 and 127.17 is: 173.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.68 : 175.25 = 127.17 : x
  2. Step 2: Convert to fraction form
    128.68/175.25 = 127.17/x
  3. Step 3: Cross multiply
    128.68x = 175.25 × 127.17
  4. Step 4: Simplify right side
    128.68x = 22,286.86
  5. Step 5: Solve for x
    x = 22,286.86/128.68
  6. Step 6: Final answer
    x = 173.20

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.