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Finding the Fourth Proportional to 117.12, 161.42 and 85.97

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Solution

The fourth proportional to 117.12, 161.42 and 85.97 is: 118.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.12 : 161.42 = 85.97 : x
  2. Step 2: Convert to fraction form
    117.12/161.42 = 85.97/x
  3. Step 3: Cross multiply
    117.12x = 161.42 × 85.97
  4. Step 4: Simplify right side
    117.12x = 13,876.66
  5. Step 5: Solve for x
    x = 13,876.66/117.12
  6. Step 6: Final answer
    x = 118.48

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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.