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Finding the Fourth Proportional to 83.61, 125.45 and 68.43

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Solution

The fourth proportional to 83.61, 125.45 and 68.43 is: 102.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.61 : 125.45 = 68.43 : x
  2. Step 2: Convert to fraction form
    83.61/125.45 = 68.43/x
  3. Step 3: Cross multiply
    83.61x = 125.45 × 68.43
  4. Step 4: Simplify right side
    83.61x = 8,584.54
  5. Step 5: Solve for x
    x = 8,584.54/83.61
  6. Step 6: Final answer
    x = 102.67

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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.