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Finding the Fourth Proportional to 132.72, 199 and 78.56

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Solution

The fourth proportional to 132.72, 199 and 78.56 is: 117.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.72 : 199 = 78.56 : x
  2. Step 2: Convert to fraction form
    132.72/199 = 78.56/x
  3. Step 3: Cross multiply
    132.72x = 199 × 78.56
  4. Step 4: Simplify right side
    132.72x = 15,633.44
  5. Step 5: Solve for x
    x = 15,633.44/132.72
  6. Step 6: Final answer
    x = 117.79

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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.