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Finding the Fourth Proportional to 209.87, 289.51 and 122.53

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Solution

The fourth proportional to 209.87, 289.51 and 122.53 is: 169.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.87 : 289.51 = 122.53 : x
  2. Step 2: Convert to fraction form
    209.87/289.51 = 122.53/x
  3. Step 3: Cross multiply
    209.87x = 289.51 × 122.53
  4. Step 4: Simplify right side
    209.87x = 35,473.66
  5. Step 5: Solve for x
    x = 35,473.66/209.87
  6. Step 6: Final answer
    x = 169.03

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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.