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Finding the Fourth Proportional to 138.56, 191.12 and 86.88

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Solution

The fourth proportional to 138.56, 191.12 and 86.88 is: 119.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.56 : 191.12 = 86.88 : x
  2. Step 2: Convert to fraction form
    138.56/191.12 = 86.88/x
  3. Step 3: Cross multiply
    138.56x = 191.12 × 86.88
  4. Step 4: Simplify right side
    138.56x = 16,604.51
  5. Step 5: Solve for x
    x = 16,604.51/138.56
  6. Step 6: Final answer
    x = 119.84

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