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Finding the Fourth Proportional to 74.87, 112.28 and 34.27

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Solution

The fourth proportional to 74.87, 112.28 and 34.27 is: 51.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.87 : 112.28 = 34.27 : x
  2. Step 2: Convert to fraction form
    74.87/112.28 = 34.27/x
  3. Step 3: Cross multiply
    74.87x = 112.28 × 34.27
  4. Step 4: Simplify right side
    74.87x = 3,847.64
  5. Step 5: Solve for x
    x = 3,847.64/74.87
  6. Step 6: Final answer
    x = 51.39

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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.