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Finding the Fourth Proportional to 86.33, 118.90 and 67.87

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Solution

The fourth proportional to 86.33, 118.90 and 67.87 is: 93.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.33 : 118.90 = 67.87 : x
  2. Step 2: Convert to fraction form
    86.33/118.90 = 67.87/x
  3. Step 3: Cross multiply
    86.33x = 118.90 × 67.87
  4. Step 4: Simplify right side
    86.33x = 8,069.98
  5. Step 5: Solve for x
    x = 8,069.98/86.33
  6. Step 6: Final answer
    x = 93.48

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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.