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Finding the Fourth Proportional to 863.30, 1,295.17 and 315.94

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Solution

The fourth proportional to 863.30, 1,295.17 and 315.94 is: 473.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.30 : 1,295.17 = 315.94 : x
  2. Step 2: Convert to fraction form
    863.30/1,295.17 = 315.94/x
  3. Step 3: Cross multiply
    863.30x = 1,295.17 × 315.94
  4. Step 4: Simplify right side
    863.30x = 409,196.01
  5. Step 5: Solve for x
    x = 409,196.01/863.30
  6. Step 6: Final answer
    x = 473.99

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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.