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Finding the Fourth Proportional to 151.54, 209.18 and 118.72

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Solution

The fourth proportional to 151.54, 209.18 and 118.72 is: 163.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.54 : 209.18 = 118.72 : x
  2. Step 2: Convert to fraction form
    151.54/209.18 = 118.72/x
  3. Step 3: Cross multiply
    151.54x = 209.18 × 118.72
  4. Step 4: Simplify right side
    151.54x = 24,833.85
  5. Step 5: Solve for x
    x = 24,833.85/151.54
  6. Step 6: Final answer
    x = 163.88

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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.