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Finding the Fourth Proportional to 75.74, 113.10 and 68.85

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Solution

The fourth proportional to 75.74, 113.10 and 68.85 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.74 : 113.10 = 68.85 : x
  2. Step 2: Convert to fraction form
    75.74/113.10 = 68.85/x
  3. Step 3: Cross multiply
    75.74x = 113.10 × 68.85
  4. Step 4: Simplify right side
    75.74x = 7,786.68
  5. Step 5: Solve for x
    x = 7,786.68/75.74
  6. Step 6: Final answer
    x = 102.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.