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Finding the Fourth Proportional to 153.11, 229.68 and 61.85

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Solution

The fourth proportional to 153.11, 229.68 and 61.85 is: 92.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.11 : 229.68 = 61.85 : x
  2. Step 2: Convert to fraction form
    153.11/229.68 = 61.85/x
  3. Step 3: Cross multiply
    153.11x = 229.68 × 61.85
  4. Step 4: Simplify right side
    153.11x = 14,205.71
  5. Step 5: Solve for x
    x = 14,205.71/153.11
  6. Step 6: Final answer
    x = 92.78

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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.