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Finding the Fourth Proportional to 2,811.70, 4,217.40 and 863.75

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Solution

The fourth proportional to 2,811.70, 4,217.40 and 863.75 is: 1,295.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.70 : 4,217.40 = 863.75 : x
  2. Step 2: Convert to fraction form
    2,811.70/4,217.40 = 863.75/x
  3. Step 3: Cross multiply
    2,811.70x = 4,217.40 × 863.75
  4. Step 4: Simplify right side
    2,811.70x = 3,642,779.25
  5. Step 5: Solve for x
    x = 3,642,779.25/2,811.70
  6. Step 6: Final answer
    x = 1,295.58

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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.