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Finding the Fourth Proportional to 163.20, 245.20 and 122.70

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Solution

The fourth proportional to 163.20, 245.20 and 122.70 is: 184.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.20 : 245.20 = 122.70 : x
  2. Step 2: Convert to fraction form
    163.20/245.20 = 122.70/x
  3. Step 3: Cross multiply
    163.20x = 245.20 × 122.70
  4. Step 4: Simplify right side
    163.20x = 30,086.04
  5. Step 5: Solve for x
    x = 30,086.04/163.20
  6. Step 6: Final answer
    x = 184.35

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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.