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Finding the Fourth Proportional to 118.57, 163.55 and 87.57

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Solution

The fourth proportional to 118.57, 163.55 and 87.57 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.57 : 163.55 = 87.57 : x
  2. Step 2: Convert to fraction form
    118.57/163.55 = 87.57/x
  3. Step 3: Cross multiply
    118.57x = 163.55 × 87.57
  4. Step 4: Simplify right side
    118.57x = 14,321.26
  5. Step 5: Solve for x
    x = 14,321.26/118.57
  6. Step 6: Final answer
    x = 120.78

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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.