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Finding the Fourth Proportional to 86.95, 119.95 and 67.28

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Solution

The fourth proportional to 86.95, 119.95 and 67.28 is: 92.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.95 : 119.95 = 67.28 : x
  2. Step 2: Convert to fraction form
    86.95/119.95 = 67.28/x
  3. Step 3: Cross multiply
    86.95x = 119.95 × 67.28
  4. Step 4: Simplify right side
    86.95x = 8,069.90
  5. Step 5: Solve for x
    x = 8,069.90/86.95
  6. Step 6: Final answer
    x = 92.82

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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.