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Finding the Fourth Proportional to 144.85, 217.28 and 42.13

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Solution

The fourth proportional to 144.85, 217.28 and 42.13 is: 63.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.85 : 217.28 = 42.13 : x
  2. Step 2: Convert to fraction form
    144.85/217.28 = 42.13/x
  3. Step 3: Cross multiply
    144.85x = 217.28 × 42.13
  4. Step 4: Simplify right side
    144.85x = 9,153.80
  5. Step 5: Solve for x
    x = 9,153.80/144.85
  6. Step 6: Final answer
    x = 63.20

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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.