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Finding the Fourth Proportional to 83.50, 125.31 and 47.42

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Solution

The fourth proportional to 83.50, 125.31 and 47.42 is: 71.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.50 : 125.31 = 47.42 : x
  2. Step 2: Convert to fraction form
    83.50/125.31 = 47.42/x
  3. Step 3: Cross multiply
    83.50x = 125.31 × 47.42
  4. Step 4: Simplify right side
    83.50x = 5,942.20
  5. Step 5: Solve for x
    x = 5,942.20/83.50
  6. Step 6: Final answer
    x = 71.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.