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Finding the Fourth Proportional to 308.90, 426.60 and 215.88

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Solution

The fourth proportional to 308.90, 426.60 and 215.88 is: 298.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.90 : 426.60 = 215.88 : x
  2. Step 2: Convert to fraction form
    308.90/426.60 = 215.88/x
  3. Step 3: Cross multiply
    308.90x = 426.60 × 215.88
  4. Step 4: Simplify right side
    308.90x = 92,094.41
  5. Step 5: Solve for x
    x = 92,094.41/308.90
  6. Step 6: Final answer
    x = 298.14

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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.