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Finding the Fourth Proportional to 308.31, 425.30 and 191.67

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Solution

The fourth proportional to 308.31, 425.30 and 191.67 is: 264.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.31 : 425.30 = 191.67 : x
  2. Step 2: Convert to fraction form
    308.31/425.30 = 191.67/x
  3. Step 3: Cross multiply
    308.31x = 425.30 × 191.67
  4. Step 4: Simplify right side
    308.31x = 81,517.25
  5. Step 5: Solve for x
    x = 81,517.25/308.31
  6. Step 6: Final answer
    x = 264.40

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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.