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Finding the Fourth Proportional to 76.78, 114.97 and 45.85

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Solution

The fourth proportional to 76.78, 114.97 and 45.85 is: 68.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.78 : 114.97 = 45.85 : x
  2. Step 2: Convert to fraction form
    76.78/114.97 = 45.85/x
  3. Step 3: Cross multiply
    76.78x = 114.97 × 45.85
  4. Step 4: Simplify right side
    76.78x = 5,270.97
  5. Step 5: Solve for x
    x = 5,270.97/76.78
  6. Step 6: Final answer
    x = 68.65

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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.