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Finding the Fourth Proportional to 204.47, 282.40 and 138.86

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Solution

The fourth proportional to 204.47, 282.40 and 138.86 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.47 : 282.40 = 138.86 : x
  2. Step 2: Convert to fraction form
    204.47/282.40 = 138.86/x
  3. Step 3: Cross multiply
    204.47x = 282.40 × 138.86
  4. Step 4: Simplify right side
    204.47x = 39,213.62
  5. Step 5: Solve for x
    x = 39,213.62/204.47
  6. Step 6: Final answer
    x = 191.78

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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.