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Finding the Fourth Proportional to 147.31, 203.18 and 138.61

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Solution

The fourth proportional to 147.31, 203.18 and 138.61 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.31 : 203.18 = 138.61 : x
  2. Step 2: Convert to fraction form
    147.31/203.18 = 138.61/x
  3. Step 3: Cross multiply
    147.31x = 203.18 × 138.61
  4. Step 4: Simplify right side
    147.31x = 28,162.78
  5. Step 5: Solve for x
    x = 28,162.78/147.31
  6. Step 6: Final answer
    x = 191.18

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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.