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Finding the Fourth Proportional to 83.48, 125.26 and 71.40

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Solution

The fourth proportional to 83.48, 125.26 and 71.40 is: 107.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.48 : 125.26 = 71.40 : x
  2. Step 2: Convert to fraction form
    83.48/125.26 = 71.40/x
  3. Step 3: Cross multiply
    83.48x = 125.26 × 71.40
  4. Step 4: Simplify right side
    83.48x = 8,943.56
  5. Step 5: Solve for x
    x = 8,943.56/83.48
  6. Step 6: Final answer
    x = 107.13

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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.