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Finding the Fourth Proportional to 76.99, 115.69 and 74.76

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Solution

The fourth proportional to 76.99, 115.69 and 74.76 is: 112.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.99 : 115.69 = 74.76 : x
  2. Step 2: Convert to fraction form
    76.99/115.69 = 74.76/x
  3. Step 3: Cross multiply
    76.99x = 115.69 × 74.76
  4. Step 4: Simplify right side
    76.99x = 8,648.98
  5. Step 5: Solve for x
    x = 8,648.98/76.99
  6. Step 6: Final answer
    x = 112.34

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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.