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Finding the Fourth Proportional to 308.97, 426.23 and 215.81

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Solution

The fourth proportional to 308.97, 426.23 and 215.81 is: 297.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.97 : 426.23 = 215.81 : x
  2. Step 2: Convert to fraction form
    308.97/426.23 = 215.81/x
  3. Step 3: Cross multiply
    308.97x = 426.23 × 215.81
  4. Step 4: Simplify right side
    308.97x = 91,981.49
  5. Step 5: Solve for x
    x = 91,981.49/308.97
  6. Step 6: Final answer
    x = 297.70

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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.