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Finding the Fourth Proportional to 101.39, 139.90 and 82.94

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Solution

The fourth proportional to 101.39, 139.90 and 82.94 is: 114.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.39 : 139.90 = 82.94 : x
  2. Step 2: Convert to fraction form
    101.39/139.90 = 82.94/x
  3. Step 3: Cross multiply
    101.39x = 139.90 × 82.94
  4. Step 4: Simplify right side
    101.39x = 11,603.31
  5. Step 5: Solve for x
    x = 11,603.31/101.39
  6. Step 6: Final answer
    x = 114.44

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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.