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Finding the Fourth Proportional to 239.38, 330.35 and 139.77

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Solution

The fourth proportional to 239.38, 330.35 and 139.77 is: 192.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.38 : 330.35 = 139.77 : x
  2. Step 2: Convert to fraction form
    239.38/330.35 = 139.77/x
  3. Step 3: Cross multiply
    239.38x = 330.35 × 139.77
  4. Step 4: Simplify right side
    239.38x = 46,172.32
  5. Step 5: Solve for x
    x = 46,172.32/239.38
  6. Step 6: Final answer
    x = 192.88

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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.