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Finding the Fourth Proportional to 115.56, 159.47 and 82.86

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Solution

The fourth proportional to 115.56, 159.47 and 82.86 is: 114.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.56 : 159.47 = 82.86 : x
  2. Step 2: Convert to fraction form
    115.56/159.47 = 82.86/x
  3. Step 3: Cross multiply
    115.56x = 159.47 × 82.86
  4. Step 4: Simplify right side
    115.56x = 13,213.68
  5. Step 5: Solve for x
    x = 13,213.68/115.56
  6. Step 6: Final answer
    x = 114.34

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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.