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Finding the Fourth Proportional to 83.70, 125.69 and 65.75

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Solution

The fourth proportional to 83.70, 125.69 and 65.75 is: 98.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.70 : 125.69 = 65.75 : x
  2. Step 2: Convert to fraction form
    83.70/125.69 = 65.75/x
  3. Step 3: Cross multiply
    83.70x = 125.69 × 65.75
  4. Step 4: Simplify right side
    83.70x = 8,263.16
  5. Step 5: Solve for x
    x = 8,263.16/83.70
  6. Step 6: Final answer
    x = 98.72

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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.