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Finding the Fourth Proportional to 97.80, 135.06 and 81.27

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Solution

The fourth proportional to 97.80, 135.06 and 81.27 is: 112.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.80 : 135.06 = 81.27 : x
  2. Step 2: Convert to fraction form
    97.80/135.06 = 81.27/x
  3. Step 3: Cross multiply
    97.80x = 135.06 × 81.27
  4. Step 4: Simplify right side
    97.80x = 10,976.33
  5. Step 5: Solve for x
    x = 10,976.33/97.80
  6. Step 6: Final answer
    x = 112.23

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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.