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Finding the Fourth Proportional to 151.62, 208.89 and 128.27

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Solution

The fourth proportional to 151.62, 208.89 and 128.27 is: 176.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.62 : 208.89 = 128.27 : x
  2. Step 2: Convert to fraction form
    151.62/208.89 = 128.27/x
  3. Step 3: Cross multiply
    151.62x = 208.89 × 128.27
  4. Step 4: Simplify right side
    151.62x = 26,793.28
  5. Step 5: Solve for x
    x = 26,793.28/151.62
  6. Step 6: Final answer
    x = 176.71

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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.