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Finding the Fourth Proportional to 123.24, 170.79 and 121.50

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Solution

The fourth proportional to 123.24, 170.79 and 121.50 is: 168.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.24 : 170.79 = 121.50 : x
  2. Step 2: Convert to fraction form
    123.24/170.79 = 121.50/x
  3. Step 3: Cross multiply
    123.24x = 170.79 × 121.50
  4. Step 4: Simplify right side
    123.24x = 20,750.99
  5. Step 5: Solve for x
    x = 20,750.99/123.24
  6. Step 6: Final answer
    x = 168.38

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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.