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Finding the Fourth Proportional to 308.88, 426.36 and 215.76

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Solution

The fourth proportional to 308.88, 426.36 and 215.76 is: 297.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.88 : 426.36 = 215.76 : x
  2. Step 2: Convert to fraction form
    308.88/426.36 = 215.76/x
  3. Step 3: Cross multiply
    308.88x = 426.36 × 215.76
  4. Step 4: Simplify right side
    308.88x = 91,991.43
  5. Step 5: Solve for x
    x = 91,991.43/308.88
  6. Step 6: Final answer
    x = 297.82

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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.