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Finding the Fourth Proportional to 2,811.16, 4,216.80 and 863.38

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Solution

The fourth proportional to 2,811.16, 4,216.80 and 863.38 is: 1,295.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.16 : 4,216.80 = 863.38 : x
  2. Step 2: Convert to fraction form
    2,811.16/4,216.80 = 863.38/x
  3. Step 3: Cross multiply
    2,811.16x = 4,216.80 × 863.38
  4. Step 4: Simplify right side
    2,811.16x = 3,640,679.70
  5. Step 5: Solve for x
    x = 3,640,679.70/2,811.16
  6. Step 6: Final answer
    x = 1,295.08

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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.