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Finding the Fourth Proportional to 863.95, 1,296.07 and 316.49

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Solution

The fourth proportional to 863.95, 1,296.07 and 316.49 is: 474.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.95 : 1,296.07 = 316.49 : x
  2. Step 2: Convert to fraction form
    863.95/1,296.07 = 316.49/x
  3. Step 3: Cross multiply
    863.95x = 1,296.07 × 316.49
  4. Step 4: Simplify right side
    863.95x = 410,193.19
  5. Step 5: Solve for x
    x = 410,193.19/863.95
  6. Step 6: Final answer
    x = 474.79

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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.