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Finding the Fourth Proportional to 126.80, 189.02 and 121.04

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Solution

The fourth proportional to 126.80, 189.02 and 121.04 is: 180.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.80 : 189.02 = 121.04 : x
  2. Step 2: Convert to fraction form
    126.80/189.02 = 121.04/x
  3. Step 3: Cross multiply
    126.80x = 189.02 × 121.04
  4. Step 4: Simplify right side
    126.80x = 22,878.98
  5. Step 5: Solve for x
    x = 22,878.98/126.80
  6. Step 6: Final answer
    x = 180.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.