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Finding the Fourth Proportional to 81.53, 112.53 and 48.80

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Solution

The fourth proportional to 81.53, 112.53 and 48.80 is: 67.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.53 : 112.53 = 48.80 : x
  2. Step 2: Convert to fraction form
    81.53/112.53 = 48.80/x
  3. Step 3: Cross multiply
    81.53x = 112.53 × 48.80
  4. Step 4: Simplify right side
    81.53x = 5,491.79
  5. Step 5: Solve for x
    x = 5,491.79/81.53
  6. Step 6: Final answer
    x = 67.36

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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.