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Finding the Fourth Proportional to 125.73, 172.23 and 121.11

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Solution

The fourth proportional to 125.73, 172.23 and 121.11 is: 165.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.73 : 172.23 = 121.11 : x
  2. Step 2: Convert to fraction form
    125.73/172.23 = 121.11/x
  3. Step 3: Cross multiply
    125.73x = 172.23 × 121.11
  4. Step 4: Simplify right side
    125.73x = 20,858.78
  5. Step 5: Solve for x
    x = 20,858.78/125.73
  6. Step 6: Final answer
    x = 165.90

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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.