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Finding the Fourth Proportional to 81.58, 112.55 and 48.82

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Solution

The fourth proportional to 81.58, 112.55 and 48.82 is: 67.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.58 : 112.55 = 48.82 : x
  2. Step 2: Convert to fraction form
    81.58/112.55 = 48.82/x
  3. Step 3: Cross multiply
    81.58x = 112.55 × 48.82
  4. Step 4: Simplify right side
    81.58x = 5,494.69
  5. Step 5: Solve for x
    x = 5,494.69/81.58
  6. Step 6: Final answer
    x = 67.35

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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.