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Finding the Fourth Proportional to 115.20, 159.06 and 104.12

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Solution

The fourth proportional to 115.20, 159.06 and 104.12 is: 143.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 159.06 = 104.12 : x
  2. Step 2: Convert to fraction form
    115.20/159.06 = 104.12/x
  3. Step 3: Cross multiply
    115.20x = 159.06 × 104.12
  4. Step 4: Simplify right side
    115.20x = 16,561.33
  5. Step 5: Solve for x
    x = 16,561.33/115.20
  6. Step 6: Final answer
    x = 143.76

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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.