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Finding the Fourth Proportional to 308.08, 424.72 and 209.66

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Solution

The fourth proportional to 308.08, 424.72 and 209.66 is: 289.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.08 : 424.72 = 209.66 : x
  2. Step 2: Convert to fraction form
    308.08/424.72 = 209.66/x
  3. Step 3: Cross multiply
    308.08x = 424.72 × 209.66
  4. Step 4: Simplify right side
    308.08x = 89,046.80
  5. Step 5: Solve for x
    x = 89,046.80/308.08
  6. Step 6: Final answer
    x = 289.04

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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.