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Finding the Fourth Proportional to 132.96, 199.12 and 78.69

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Solution

The fourth proportional to 132.96, 199.12 and 78.69 is: 117.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.96 : 199.12 = 78.69 : x
  2. Step 2: Convert to fraction form
    132.96/199.12 = 78.69/x
  3. Step 3: Cross multiply
    132.96x = 199.12 × 78.69
  4. Step 4: Simplify right side
    132.96x = 15,668.75
  5. Step 5: Solve for x
    x = 15,668.75/132.96
  6. Step 6: Final answer
    x = 117.85

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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.