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Finding the Fourth Proportional to 239.28, 330.12 and 135.72

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Solution

The fourth proportional to 239.28, 330.12 and 135.72 is: 187.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.28 : 330.12 = 135.72 : x
  2. Step 2: Convert to fraction form
    239.28/330.12 = 135.72/x
  3. Step 3: Cross multiply
    239.28x = 330.12 × 135.72
  4. Step 4: Simplify right side
    239.28x = 44,803.89
  5. Step 5: Solve for x
    x = 44,803.89/239.28
  6. Step 6: Final answer
    x = 187.24

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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.