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Finding the Fourth Proportional to 239.29, 330.22 and 139.72

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Solution

The fourth proportional to 239.29, 330.22 and 139.72 is: 192.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.29 : 330.22 = 139.72 : x
  2. Step 2: Convert to fraction form
    239.29/330.22 = 139.72/x
  3. Step 3: Cross multiply
    239.29x = 330.22 × 139.72
  4. Step 4: Simplify right side
    239.29x = 46,138.34
  5. Step 5: Solve for x
    x = 46,138.34/239.29
  6. Step 6: Final answer
    x = 192.81

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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.