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Finding the Fourth Proportional to 308.41, 425.49 and 215.12

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Solution

The fourth proportional to 308.41, 425.49 and 215.12 is: 296.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.41 : 425.49 = 215.12 : x
  2. Step 2: Convert to fraction form
    308.41/425.49 = 215.12/x
  3. Step 3: Cross multiply
    308.41x = 425.49 × 215.12
  4. Step 4: Simplify right side
    308.41x = 91,531.67
  5. Step 5: Solve for x
    x = 91,531.67/308.41
  6. Step 6: Final answer
    x = 296.79

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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.