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Finding the Fourth Proportional to 76.68, 115.09 and 42.48

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Solution

The fourth proportional to 76.68, 115.09 and 42.48 is: 63.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.68 : 115.09 = 42.48 : x
  2. Step 2: Convert to fraction form
    76.68/115.09 = 42.48/x
  3. Step 3: Cross multiply
    76.68x = 115.09 × 42.48
  4. Step 4: Simplify right side
    76.68x = 4,888.92
  5. Step 5: Solve for x
    x = 4,888.92/76.68
  6. Step 6: Final answer
    x = 63.76

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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.