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Finding the Fourth Proportional to 115.95, 159.97 and 66.82

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Solution

The fourth proportional to 115.95, 159.97 and 66.82 is: 92.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.95 : 159.97 = 66.82 : x
  2. Step 2: Convert to fraction form
    115.95/159.97 = 66.82/x
  3. Step 3: Cross multiply
    115.95x = 159.97 × 66.82
  4. Step 4: Simplify right side
    115.95x = 10,688.87
  5. Step 5: Solve for x
    x = 10,688.87/115.95
  6. Step 6: Final answer
    x = 92.18

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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.