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Finding the Fourth Proportional to 115.70, 159.67 and 86.54

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Solution

The fourth proportional to 115.70, 159.67 and 86.54 is: 119.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.70 : 159.67 = 86.54 : x
  2. Step 2: Convert to fraction form
    115.70/159.67 = 86.54/x
  3. Step 3: Cross multiply
    115.70x = 159.67 × 86.54
  4. Step 4: Simplify right side
    115.70x = 13,817.15
  5. Step 5: Solve for x
    x = 13,817.15/115.70
  6. Step 6: Final answer
    x = 119.43

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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.