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Finding the Fourth Proportional to 83.91, 126.60 and 79.59

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Solution

The fourth proportional to 83.91, 126.60 and 79.59 is: 120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.91 : 126.60 = 79.59 : x
  2. Step 2: Convert to fraction form
    83.91/126.60 = 79.59/x
  3. Step 3: Cross multiply
    83.91x = 126.60 × 79.59
  4. Step 4: Simplify right side
    83.91x = 10,076.09
  5. Step 5: Solve for x
    x = 10,076.09/83.91
  6. Step 6: Final answer
    x = 120.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.