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Finding the Fourth Proportional to 100.57, 139.42 and 97.21

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Solution

The fourth proportional to 100.57, 139.42 and 97.21 is: 134.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.57 : 139.42 = 97.21 : x
  2. Step 2: Convert to fraction form
    100.57/139.42 = 97.21/x
  3. Step 3: Cross multiply
    100.57x = 139.42 × 97.21
  4. Step 4: Simplify right side
    100.57x = 13,553.02
  5. Step 5: Solve for x
    x = 13,553.02/100.57
  6. Step 6: Final answer
    x = 134.76

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.