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Finding the Fourth Proportional to 240.50, 331.90 and 135.61

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Solution

The fourth proportional to 240.50, 331.90 and 135.61 is: 187.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.50 : 331.90 = 135.61 : x
  2. Step 2: Convert to fraction form
    240.50/331.90 = 135.61/x
  3. Step 3: Cross multiply
    240.50x = 331.90 × 135.61
  4. Step 4: Simplify right side
    240.50x = 45,007.79
  5. Step 5: Solve for x
    x = 45,007.79/240.50
  6. Step 6: Final answer
    x = 187.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.