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Finding the Fourth Proportional to 151.72, 209.37 and 92.70

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Solution

The fourth proportional to 151.72, 209.37 and 92.70 is: 127.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.72 : 209.37 = 92.70 : x
  2. Step 2: Convert to fraction form
    151.72/209.37 = 92.70/x
  3. Step 3: Cross multiply
    151.72x = 209.37 × 92.70
  4. Step 4: Simplify right side
    151.72x = 19,408.60
  5. Step 5: Solve for x
    x = 19,408.60/151.72
  6. Step 6: Final answer
    x = 127.92

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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.