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Finding the Fourth Proportional to 239.46, 330.51 and 139.85

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Solution

The fourth proportional to 239.46, 330.51 and 139.85 is: 193.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.46 : 330.51 = 139.85 : x
  2. Step 2: Convert to fraction form
    239.46/330.51 = 139.85/x
  3. Step 3: Cross multiply
    239.46x = 330.51 × 139.85
  4. Step 4: Simplify right side
    239.46x = 46,221.82
  5. Step 5: Solve for x
    x = 46,221.82/239.46
  6. Step 6: Final answer
    x = 193.03

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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.