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Finding the Fourth Proportional to 84.01, 126.21 and 79.15

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Solution

The fourth proportional to 84.01, 126.21 and 79.15 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.01 : 126.21 = 79.15 : x
  2. Step 2: Convert to fraction form
    84.01/126.21 = 79.15/x
  3. Step 3: Cross multiply
    84.01x = 126.21 × 79.15
  4. Step 4: Simplify right side
    84.01x = 9,989.52
  5. Step 5: Solve for x
    x = 9,989.52/84.01
  6. Step 6: Final answer
    x = 118.91

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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.