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Finding the Fourth Proportional to 71.48, 98.75 and 55.22

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Solution

The fourth proportional to 71.48, 98.75 and 55.22 is: 76.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.48 : 98.75 = 55.22 : x
  2. Step 2: Convert to fraction form
    71.48/98.75 = 55.22/x
  3. Step 3: Cross multiply
    71.48x = 98.75 × 55.22
  4. Step 4: Simplify right side
    71.48x = 5,452.62
  5. Step 5: Solve for x
    x = 5,452.62/71.48
  6. Step 6: Final answer
    x = 76.28

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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.