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Finding the Fourth Proportional to 863.12, 1,294.81 and 315.17

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Solution

The fourth proportional to 863.12, 1,294.81 and 315.17 is: 472.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.12 : 1,294.81 = 315.17 : x
  2. Step 2: Convert to fraction form
    863.12/1,294.81 = 315.17/x
  3. Step 3: Cross multiply
    863.12x = 1,294.81 × 315.17
  4. Step 4: Simplify right side
    863.12x = 408,087.72
  5. Step 5: Solve for x
    x = 408,087.72/863.12
  6. Step 6: Final answer
    x = 472.80

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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.