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Finding the Fourth Proportional to 308.09, 424.95 and 209.68

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Solution

The fourth proportional to 308.09, 424.95 and 209.68 is: 289.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.09 : 424.95 = 209.68 : x
  2. Step 2: Convert to fraction form
    308.09/424.95 = 209.68/x
  3. Step 3: Cross multiply
    308.09x = 424.95 × 209.68
  4. Step 4: Simplify right side
    308.09x = 89,103.52
  5. Step 5: Solve for x
    x = 89,103.52/308.09
  6. Step 6: Final answer
    x = 289.21

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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.