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Finding the Fourth Proportional to 185.73, 256.20 and 139.12

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Solution

The fourth proportional to 185.73, 256.20 and 139.12 is: 191.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.73 : 256.20 = 139.12 : x
  2. Step 2: Convert to fraction form
    185.73/256.20 = 139.12/x
  3. Step 3: Cross multiply
    185.73x = 256.20 × 139.12
  4. Step 4: Simplify right side
    185.73x = 35,641.38
  5. Step 5: Solve for x
    x = 35,641.38/185.73
  6. Step 6: Final answer
    x = 191.90

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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.