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Finding the Fourth Proportional to 2,811.10, 4,216.65 and 863.30

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Solution

The fourth proportional to 2,811.10, 4,216.65 and 863.30 is: 1,294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.10 : 4,216.65 = 863.30 : x
  2. Step 2: Convert to fraction form
    2,811.10/4,216.65 = 863.30/x
  3. Step 3: Cross multiply
    2,811.10x = 4,216.65 × 863.30
  4. Step 4: Simplify right side
    2,811.10x = 3,640,233.95
  5. Step 5: Solve for x
    x = 3,640,233.95/2,811.10
  6. Step 6: Final answer
    x = 1,294.95

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1.5x scale

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.