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Finding the Fourth Proportional to 76.05, 104.28 and 74.23

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Solution

The fourth proportional to 76.05, 104.28 and 74.23 is: 101.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.05 : 104.28 = 74.23 : x
  2. Step 2: Convert to fraction form
    76.05/104.28 = 74.23/x
  3. Step 3: Cross multiply
    76.05x = 104.28 × 74.23
  4. Step 4: Simplify right side
    76.05x = 7,740.17
  5. Step 5: Solve for x
    x = 7,740.17/76.05
  6. Step 6: Final answer
    x = 101.78

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.