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Finding the Fourth Proportional to 84.86, 126.38 and 83.95

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Solution

The fourth proportional to 84.86, 126.38 and 83.95 is: 125.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.86 : 126.38 = 83.95 : x
  2. Step 2: Convert to fraction form
    84.86/126.38 = 83.95/x
  3. Step 3: Cross multiply
    84.86x = 126.38 × 83.95
  4. Step 4: Simplify right side
    84.86x = 10,608.97
  5. Step 5: Solve for x
    x = 10,608.97/84.86
  6. Step 6: Final answer
    x = 125.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.