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Finding the Fourth Proportional to 239.78, 330.90 and 136.28

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Solution

The fourth proportional to 239.78, 330.90 and 136.28 is: 188.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.78 : 330.90 = 136.28 : x
  2. Step 2: Convert to fraction form
    239.78/330.90 = 136.28/x
  3. Step 3: Cross multiply
    239.78x = 330.90 × 136.28
  4. Step 4: Simplify right side
    239.78x = 45,095.05
  5. Step 5: Solve for x
    x = 45,095.05/239.78
  6. Step 6: Final answer
    x = 188.07

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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.