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Finding the Fourth Proportional to 308.13, 425.46 and 215.11

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Solution

The fourth proportional to 308.13, 425.46 and 215.11 is: 297.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.13 : 425.46 = 215.11 : x
  2. Step 2: Convert to fraction form
    308.13/425.46 = 215.11/x
  3. Step 3: Cross multiply
    308.13x = 425.46 × 215.11
  4. Step 4: Simplify right side
    308.13x = 91,520.70
  5. Step 5: Solve for x
    x = 91,520.70/308.13
  6. Step 6: Final answer
    x = 297.02

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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.