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Finding the Fourth Proportional to 83.55, 125.42 and 68.39

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Solution

The fourth proportional to 83.55, 125.42 and 68.39 is: 102.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.55 : 125.42 = 68.39 : x
  2. Step 2: Convert to fraction form
    83.55/125.42 = 68.39/x
  3. Step 3: Cross multiply
    83.55x = 125.42 × 68.39
  4. Step 4: Simplify right side
    83.55x = 8,576.50
  5. Step 5: Solve for x
    x = 8,576.50/83.55
  6. Step 6: Final answer
    x = 102.65

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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.