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Finding the Fourth Proportional to 126.79, 173.71 and 121.93

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Solution

The fourth proportional to 126.79, 173.71 and 121.93 is: 167.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.79 : 173.71 = 121.93 : x
  2. Step 2: Convert to fraction form
    126.79/173.71 = 121.93/x
  3. Step 3: Cross multiply
    126.79x = 173.71 × 121.93
  4. Step 4: Simplify right side
    126.79x = 21,179.85
  5. Step 5: Solve for x
    x = 21,179.85/126.79
  6. Step 6: Final answer
    x = 167.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.