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Finding the Fourth Proportional to 71.72, 98.97 and 42.23

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Solution

The fourth proportional to 71.72, 98.97 and 42.23 is: 58.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.72 : 98.97 = 42.23 : x
  2. Step 2: Convert to fraction form
    71.72/98.97 = 42.23/x
  3. Step 3: Cross multiply
    71.72x = 98.97 × 42.23
  4. Step 4: Simplify right side
    71.72x = 4,179.01
  5. Step 5: Solve for x
    x = 4,179.01/71.72
  6. Step 6: Final answer
    x = 58.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.