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Finding the Fourth Proportional to 83.79, 125.66 and 43.20

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Solution

The fourth proportional to 83.79, 125.66 and 43.20 is: 64.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.79 : 125.66 = 43.20 : x
  2. Step 2: Convert to fraction form
    83.79/125.66 = 43.20/x
  3. Step 3: Cross multiply
    83.79x = 125.66 × 43.20
  4. Step 4: Simplify right side
    83.79x = 5,428.30
  5. Step 5: Solve for x
    x = 5,428.30/83.79
  6. Step 6: Final answer
    x = 64.78

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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.