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Finding the Fourth Proportional to 153.11, 229.67 and 81.02

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Solution

The fourth proportional to 153.11, 229.67 and 81.02 is: 121.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.11 : 229.67 = 81.02 : x
  2. Step 2: Convert to fraction form
    153.11/229.67 = 81.02/x
  3. Step 3: Cross multiply
    153.11x = 229.67 × 81.02
  4. Step 4: Simplify right side
    153.11x = 18,607.86
  5. Step 5: Solve for x
    x = 18,607.86/153.11
  6. Step 6: Final answer
    x = 121.53

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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.