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Finding the Fourth Proportional to 100.75, 139.04 and 76.27

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Solution

The fourth proportional to 100.75, 139.04 and 76.27 is: 105.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.75 : 139.04 = 76.27 : x
  2. Step 2: Convert to fraction form
    100.75/139.04 = 76.27/x
  3. Step 3: Cross multiply
    100.75x = 139.04 × 76.27
  4. Step 4: Simplify right side
    100.75x = 10,604.58
  5. Step 5: Solve for x
    x = 10,604.58/100.75
  6. Step 6: Final answer
    x = 105.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.