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Finding the Fourth Proportional to 78.27, 117.11 and 67.56

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Solution

The fourth proportional to 78.27, 117.11 and 67.56 is: 101.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.27 : 117.11 = 67.56 : x
  2. Step 2: Convert to fraction form
    78.27/117.11 = 67.56/x
  3. Step 3: Cross multiply
    78.27x = 117.11 × 67.56
  4. Step 4: Simplify right side
    78.27x = 7,912.12
  5. Step 5: Solve for x
    x = 7,912.12/78.27
  6. Step 6: Final answer
    x = 101.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.