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Finding the Fourth Proportional to 76.62, 115.12 and 53.76

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Solution

The fourth proportional to 76.62, 115.12 and 53.76 is: 80.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.62 : 115.12 = 53.76 : x
  2. Step 2: Convert to fraction form
    76.62/115.12 = 53.76/x
  3. Step 3: Cross multiply
    76.62x = 115.12 × 53.76
  4. Step 4: Simplify right side
    76.62x = 6,188.85
  5. Step 5: Solve for x
    x = 6,188.85/76.62
  6. Step 6: Final answer
    x = 80.77

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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.