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Finding the Fourth Proportional to 240.21, 331.49 and 135.30

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Solution

The fourth proportional to 240.21, 331.49 and 135.30 is: 186.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.21 : 331.49 = 135.30 : x
  2. Step 2: Convert to fraction form
    240.21/331.49 = 135.30/x
  3. Step 3: Cross multiply
    240.21x = 331.49 × 135.30
  4. Step 4: Simplify right side
    240.21x = 44,850.94
  5. Step 5: Solve for x
    x = 44,850.94/240.21
  6. Step 6: Final answer
    x = 186.72

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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.