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Finding the Fourth Proportional to 209.76, 289.61 and 144.47

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Solution

The fourth proportional to 209.76, 289.61 and 144.47 is: 199.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.76 : 289.61 = 144.47 : x
  2. Step 2: Convert to fraction form
    209.76/289.61 = 144.47/x
  3. Step 3: Cross multiply
    209.76x = 289.61 × 144.47
  4. Step 4: Simplify right side
    209.76x = 41,837.79
  5. Step 5: Solve for x
    x = 41,837.79/209.76
  6. Step 6: Final answer
    x = 199.46

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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.