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Finding the Fourth Proportional to 115.36, 159.08 and 71.68

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Solution

The fourth proportional to 115.36, 159.08 and 71.68 is: 98.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.36 : 159.08 = 71.68 : x
  2. Step 2: Convert to fraction form
    115.36/159.08 = 71.68/x
  3. Step 3: Cross multiply
    115.36x = 159.08 × 71.68
  4. Step 4: Simplify right side
    115.36x = 11,402.85
  5. Step 5: Solve for x
    x = 11,402.85/115.36
  6. Step 6: Final answer
    x = 98.85

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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.