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Finding the Fourth Proportional to 863.61, 1,294.25 and 315.27

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Solution

The fourth proportional to 863.61, 1,294.25 and 315.27 is: 472.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.61 : 1,294.25 = 315.27 : x
  2. Step 2: Convert to fraction form
    863.61/1,294.25 = 315.27/x
  3. Step 3: Cross multiply
    863.61x = 1,294.25 × 315.27
  4. Step 4: Simplify right side
    863.61x = 408,038.20
  5. Step 5: Solve for x
    x = 408,038.20/863.61
  6. Step 6: Final answer
    x = 472.48

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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.