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Finding the Fourth Proportional to 76.96, 115.46 and 56.92

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Solution

The fourth proportional to 76.96, 115.46 and 56.92 is: 85.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.96 : 115.46 = 56.92 : x
  2. Step 2: Convert to fraction form
    76.96/115.46 = 56.92/x
  3. Step 3: Cross multiply
    76.96x = 115.46 × 56.92
  4. Step 4: Simplify right side
    76.96x = 6,571.12
  5. Step 5: Solve for x
    x = 6,571.12/76.96
  6. Step 6: Final answer
    x = 85.39

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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.