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Finding the Fourth Proportional to 77.12, 115.52 and 57.92

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Solution

The fourth proportional to 77.12, 115.52 and 57.92 is: 86.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.12 : 115.52 = 57.92 : x
  2. Step 2: Convert to fraction form
    77.12/115.52 = 57.92/x
  3. Step 3: Cross multiply
    77.12x = 115.52 × 57.92
  4. Step 4: Simplify right side
    77.12x = 6,690.92
  5. Step 5: Solve for x
    x = 6,690.92/77.12
  6. Step 6: Final answer
    x = 86.76

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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.