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Finding the Fourth Proportional to 142.48, 213.69 and 120.61

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Solution

The fourth proportional to 142.48, 213.69 and 120.61 is: 180.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.48 : 213.69 = 120.61 : x
  2. Step 2: Convert to fraction form
    142.48/213.69 = 120.61/x
  3. Step 3: Cross multiply
    142.48x = 213.69 × 120.61
  4. Step 4: Simplify right side
    142.48x = 25,773.15
  5. Step 5: Solve for x
    x = 25,773.15/142.48
  6. Step 6: Final answer
    x = 180.89

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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.