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Finding the Fourth Proportional to 209.45, 288.99 and 122.12

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Solution

The fourth proportional to 209.45, 288.99 and 122.12 is: 168.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.45 : 288.99 = 122.12 : x
  2. Step 2: Convert to fraction form
    209.45/288.99 = 122.12/x
  3. Step 3: Cross multiply
    209.45x = 288.99 × 122.12
  4. Step 4: Simplify right side
    209.45x = 35,291.46
  5. Step 5: Solve for x
    x = 35,291.46/209.45
  6. Step 6: Final answer
    x = 168.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.