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Finding the Fourth Proportional to 80.98, 111.79 and 63.45

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Solution

The fourth proportional to 80.98, 111.79 and 63.45 is: 87.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.98 : 111.79 = 63.45 : x
  2. Step 2: Convert to fraction form
    80.98/111.79 = 63.45/x
  3. Step 3: Cross multiply
    80.98x = 111.79 × 63.45
  4. Step 4: Simplify right side
    80.98x = 7,092.76
  5. Step 5: Solve for x
    x = 7,092.76/80.98
  6. Step 6: Final answer
    x = 87.59

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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.