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Finding the Fourth Proportional to 209.92, 289.68 and 122.64

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Solution

The fourth proportional to 209.92, 289.68 and 122.64 is: 169.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.92 : 289.68 = 122.64 : x
  2. Step 2: Convert to fraction form
    209.92/289.68 = 122.64/x
  3. Step 3: Cross multiply
    209.92x = 289.68 × 122.64
  4. Step 4: Simplify right side
    209.92x = 35,526.36
  5. Step 5: Solve for x
    x = 35,526.36/209.92
  6. Step 6: Final answer
    x = 169.24

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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.