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Finding the Fourth Proportional to 132.87, 199.19 and 77.89

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Solution

The fourth proportional to 132.87, 199.19 and 77.89 is: 116.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.87 : 199.19 = 77.89 : x
  2. Step 2: Convert to fraction form
    132.87/199.19 = 77.89/x
  3. Step 3: Cross multiply
    132.87x = 199.19 × 77.89
  4. Step 4: Simplify right side
    132.87x = 15,514.91
  5. Step 5: Solve for x
    x = 15,514.91/132.87
  6. Step 6: Final answer
    x = 116.77

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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.