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Finding the Fourth Proportional to 81.49, 112.51 and 50.44

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Solution

The fourth proportional to 81.49, 112.51 and 50.44 is: 69.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.49 : 112.51 = 50.44 : x
  2. Step 2: Convert to fraction form
    81.49/112.51 = 50.44/x
  3. Step 3: Cross multiply
    81.49x = 112.51 × 50.44
  4. Step 4: Simplify right side
    81.49x = 5,675.22
  5. Step 5: Solve for x
    x = 5,675.22/81.49
  6. Step 6: Final answer
    x = 69.64

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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.