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Finding the Fourth Proportional to 863.55, 1,294.56 and 315.63

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Solution

The fourth proportional to 863.55, 1,294.56 and 315.63 is: 473.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.55 : 1,294.56 = 315.63 : x
  2. Step 2: Convert to fraction form
    863.55/1,294.56 = 315.63/x
  3. Step 3: Cross multiply
    863.55x = 1,294.56 × 315.63
  4. Step 4: Simplify right side
    863.55x = 408,601.97
  5. Step 5: Solve for x
    x = 408,601.97/863.55
  6. Step 6: Final answer
    x = 473.17

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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.