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Finding the Fourth Proportional to 239.72, 330.74 and 136.22

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Solution

The fourth proportional to 239.72, 330.74 and 136.22 is: 187.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.72 : 330.74 = 136.22 : x
  2. Step 2: Convert to fraction form
    239.72/330.74 = 136.22/x
  3. Step 3: Cross multiply
    239.72x = 330.74 × 136.22
  4. Step 4: Simplify right side
    239.72x = 45,053.40
  5. Step 5: Solve for x
    x = 45,053.40/239.72
  6. Step 6: Final answer
    x = 187.94

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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.