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Finding the Fourth Proportional to 81.61, 112.60 and 48.86

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Solution

The fourth proportional to 81.61, 112.60 and 48.86 is: 67.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.61 : 112.60 = 48.86 : x
  2. Step 2: Convert to fraction form
    81.61/112.60 = 48.86/x
  3. Step 3: Cross multiply
    81.61x = 112.60 × 48.86
  4. Step 4: Simplify right side
    81.61x = 5,501.64
  5. Step 5: Solve for x
    x = 5,501.64/81.61
  6. Step 6: Final answer
    x = 67.41

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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.