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Finding the Fourth Proportional to 101.82, 139.79 and 92.10

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Solution

The fourth proportional to 101.82, 139.79 and 92.10 is: 126.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.82 : 139.79 = 92.10 : x
  2. Step 2: Convert to fraction form
    101.82/139.79 = 92.10/x
  3. Step 3: Cross multiply
    101.82x = 139.79 × 92.10
  4. Step 4: Simplify right side
    101.82x = 12,874.20
  5. Step 5: Solve for x
    x = 12,874.20/101.82
  6. Step 6: Final answer
    x = 126.44

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.