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Finding the Fourth Proportional to 125.79, 174.45 and 121.68

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Solution

The fourth proportional to 125.79, 174.45 and 121.68 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.79 : 174.45 = 121.68 : x
  2. Step 2: Convert to fraction form
    125.79/174.45 = 121.68/x
  3. Step 3: Cross multiply
    125.79x = 174.45 × 121.68
  4. Step 4: Simplify right side
    125.79x = 21,227.08
  5. Step 5: Solve for x
    x = 21,227.08/125.79
  6. Step 6: Final answer
    x = 168.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.