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Finding the Fourth Proportional to 239.18, 330.15 and 151.91

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Solution

The fourth proportional to 239.18, 330.15 and 151.91 is: 209.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.18 : 330.15 = 151.91 : x
  2. Step 2: Convert to fraction form
    239.18/330.15 = 151.91/x
  3. Step 3: Cross multiply
    239.18x = 330.15 × 151.91
  4. Step 4: Simplify right side
    239.18x = 50,151.44
  5. Step 5: Solve for x
    x = 50,151.44/239.18
  6. Step 6: Final answer
    x = 209.69

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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.