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Finding the Fourth Proportional to 151.20, 208.28 and 126.62

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Solution

The fourth proportional to 151.20, 208.28 and 126.62 is: 174.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.20 : 208.28 = 126.62 : x
  2. Step 2: Convert to fraction form
    151.20/208.28 = 126.62/x
  3. Step 3: Cross multiply
    151.20x = 208.28 × 126.62
  4. Step 4: Simplify right side
    151.20x = 26,372.41
  5. Step 5: Solve for x
    x = 26,372.41/151.20
  6. Step 6: Final answer
    x = 174.42

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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.