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Finding the Fourth Proportional to 153.52, 229.79 and 81.16

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Solution

The fourth proportional to 153.52, 229.79 and 81.16 is: 121.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.52 : 229.79 = 81.16 : x
  2. Step 2: Convert to fraction form
    153.52/229.79 = 81.16/x
  3. Step 3: Cross multiply
    153.52x = 229.79 × 81.16
  4. Step 4: Simplify right side
    153.52x = 18,648.61
  5. Step 5: Solve for x
    x = 18,648.61/153.52
  6. Step 6: Final answer
    x = 121.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.