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Finding the Fourth Proportional to 240.78, 332.25 and 137.28

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Solution

The fourth proportional to 240.78, 332.25 and 137.28 is: 189.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.78 : 332.25 = 137.28 : x
  2. Step 2: Convert to fraction form
    240.78/332.25 = 137.28/x
  3. Step 3: Cross multiply
    240.78x = 332.25 × 137.28
  4. Step 4: Simplify right side
    240.78x = 45,611.28
  5. Step 5: Solve for x
    x = 45,611.28/240.78
  6. Step 6: Final answer
    x = 189.43

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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.