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Finding the Fourth Proportional to 85.05, 126.92 and 74.79

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Solution

The fourth proportional to 85.05, 126.92 and 74.79 is: 111.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.05 : 126.92 = 74.79 : x
  2. Step 2: Convert to fraction form
    85.05/126.92 = 74.79/x
  3. Step 3: Cross multiply
    85.05x = 126.92 × 74.79
  4. Step 4: Simplify right side
    85.05x = 9,492.53
  5. Step 5: Solve for x
    x = 9,492.53/85.05
  6. Step 6: Final answer
    x = 111.61

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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.