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Finding the Fourth Proportional to 76.72, 114.92 and 52.64

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Solution

The fourth proportional to 76.72, 114.92 and 52.64 is: 78.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.72 : 114.92 = 52.64 : x
  2. Step 2: Convert to fraction form
    76.72/114.92 = 52.64/x
  3. Step 3: Cross multiply
    76.72x = 114.92 × 52.64
  4. Step 4: Simplify right side
    76.72x = 6,049.39
  5. Step 5: Solve for x
    x = 6,049.39/76.72
  6. Step 6: Final answer
    x = 78.85

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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.