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Finding the Fourth Proportional to 209.46, 289.32 and 144.24

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Solution

The fourth proportional to 209.46, 289.32 and 144.24 is: 199.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.46 : 289.32 = 144.24 : x
  2. Step 2: Convert to fraction form
    209.46/289.32 = 144.24/x
  3. Step 3: Cross multiply
    209.46x = 289.32 × 144.24
  4. Step 4: Simplify right side
    209.46x = 41,731.52
  5. Step 5: Solve for x
    x = 41,731.52/209.46
  6. Step 6: Final answer
    x = 199.23

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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.