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Finding the Fourth Proportional to 209.47, 289.15 and 144.20

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Solution

The fourth proportional to 209.47, 289.15 and 144.20 is: 199.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.47 : 289.15 = 144.20 : x
  2. Step 2: Convert to fraction form
    209.47/289.15 = 144.20/x
  3. Step 3: Cross multiply
    209.47x = 289.15 × 144.20
  4. Step 4: Simplify right side
    209.47x = 41,693.62
  5. Step 5: Solve for x
    x = 41,693.62/209.47
  6. Step 6: Final answer
    x = 199.05

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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.