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Finding the Fourth Proportional to 120.80, 163.40 and 120.80

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Solution

The fourth proportional to 120.80, 163.40 and 120.80 is: 163.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.80 : 163.40 = 120.80 : x
  2. Step 2: Convert to fraction form
    120.80/163.40 = 120.80/x
  3. Step 3: Cross multiply
    120.80x = 163.40 × 120.80
  4. Step 4: Simplify right side
    120.80x = 19,738.72
  5. Step 5: Solve for x
    x = 19,738.72/120.80
  6. Step 6: Final answer
    x = 163.40

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.