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Finding the Fourth Proportional to 86.11, 118.61 and 67.68

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Solution

The fourth proportional to 86.11, 118.61 and 67.68 is: 93.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.11 : 118.61 = 67.68 : x
  2. Step 2: Convert to fraction form
    86.11/118.61 = 67.68/x
  3. Step 3: Cross multiply
    86.11x = 118.61 × 67.68
  4. Step 4: Simplify right side
    86.11x = 8,027.52
  5. Step 5: Solve for x
    x = 8,027.52/86.11
  6. Step 6: Final answer
    x = 93.22

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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.