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Finding the Fourth Proportional to 101.44, 139.84 and 86.88

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Solution

The fourth proportional to 101.44, 139.84 and 86.88 is: 119.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.44 : 139.84 = 86.88 : x
  2. Step 2: Convert to fraction form
    101.44/139.84 = 86.88/x
  3. Step 3: Cross multiply
    101.44x = 139.84 × 86.88
  4. Step 4: Simplify right side
    101.44x = 12,149.30
  5. Step 5: Solve for x
    x = 12,149.30/101.44
  6. Step 6: Final answer
    x = 119.77

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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.