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Finding the Fourth Proportional to 49.97, 74.88 and 28.31

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Solution

The fourth proportional to 49.97, 74.88 and 28.31 is: 42.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.97 : 74.88 = 28.31 : x
  2. Step 2: Convert to fraction form
    49.97/74.88 = 28.31/x
  3. Step 3: Cross multiply
    49.97x = 74.88 × 28.31
  4. Step 4: Simplify right side
    49.97x = 2,119.48
  5. Step 5: Solve for x
    x = 2,119.48/49.97
  6. Step 6: Final answer
    x = 42.42

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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.