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Finding the Fourth Proportional to 329.39, 454.47 and 209.80

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Solution

The fourth proportional to 329.39, 454.47 and 209.80 is: 289.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.39 : 454.47 = 209.80 : x
  2. Step 2: Convert to fraction form
    329.39/454.47 = 209.80/x
  3. Step 3: Cross multiply
    329.39x = 454.47 × 209.80
  4. Step 4: Simplify right side
    329.39x = 95,345.53
  5. Step 5: Solve for x
    x = 95,345.53/329.39
  6. Step 6: Final answer
    x = 289.47

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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.