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Finding the Fourth Proportional to 151.72, 209.24 and 120.58

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Solution

The fourth proportional to 151.72, 209.24 and 120.58 is: 166.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.72 : 209.24 = 120.58 : x
  2. Step 2: Convert to fraction form
    151.72/209.24 = 120.58/x
  3. Step 3: Cross multiply
    151.72x = 209.24 × 120.58
  4. Step 4: Simplify right side
    151.72x = 25,230.16
  5. Step 5: Solve for x
    x = 25,230.16/151.72
  6. Step 6: Final answer
    x = 166.29

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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.