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Finding the Fourth Proportional to 239.38, 330.20 and 156.52

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Solution

The fourth proportional to 239.38, 330.20 and 156.52 is: 215.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.38 : 330.20 = 156.52 : x
  2. Step 2: Convert to fraction form
    239.38/330.20 = 156.52/x
  3. Step 3: Cross multiply
    239.38x = 330.20 × 156.52
  4. Step 4: Simplify right side
    239.38x = 51,682.12
  5. Step 5: Solve for x
    x = 51,682.12/239.38
  6. Step 6: Final answer
    x = 215.90

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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.