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Finding the Fourth Proportional to 163.20, 244.80 and 86.13

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Solution

The fourth proportional to 163.20, 244.80 and 86.13 is: 129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.20 : 244.80 = 86.13 : x
  2. Step 2: Convert to fraction form
    163.20/244.80 = 86.13/x
  3. Step 3: Cross multiply
    163.20x = 244.80 × 86.13
  4. Step 4: Simplify right side
    163.20x = 21,084.62
  5. Step 5: Solve for x
    x = 21,084.62/163.20
  6. Step 6: Final answer
    x = 129.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.