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Finding the Fourth Proportional to 863.43, 1,294.36 and 315.23

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Solution

The fourth proportional to 863.43, 1,294.36 and 315.23 is: 472.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.43 : 1,294.36 = 315.23 : x
  2. Step 2: Convert to fraction form
    863.43/1,294.36 = 315.23/x
  3. Step 3: Cross multiply
    863.43x = 1,294.36 × 315.23
  4. Step 4: Simplify right side
    863.43x = 408,014.63
  5. Step 5: Solve for x
    x = 408,014.63/863.43
  6. Step 6: Final answer
    x = 472.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.