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Finding the Fourth Proportional to 240.13, 331.38 and 135.21

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Solution

The fourth proportional to 240.13, 331.38 and 135.21 is: 186.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.13 : 331.38 = 135.21 : x
  2. Step 2: Convert to fraction form
    240.13/331.38 = 135.21/x
  3. Step 3: Cross multiply
    240.13x = 331.38 × 135.21
  4. Step 4: Simplify right side
    240.13x = 44,807.13
  5. Step 5: Solve for x
    x = 44,807.13/240.13
  6. Step 6: Final answer
    x = 186.59

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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.