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Finding the Fourth Proportional to 2,813.68, 4,221.24 and 865.90

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Solution

The fourth proportional to 2,813.68, 4,221.24 and 865.90 is: 1,299.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,813.68 : 4,221.24 = 865.90 : x
  2. Step 2: Convert to fraction form
    2,813.68/4,221.24 = 865.90/x
  3. Step 3: Cross multiply
    2,813.68x = 4,221.24 × 865.90
  4. Step 4: Simplify right side
    2,813.68x = 3,655,171.72
  5. Step 5: Solve for x
    x = 3,655,171.72/2,813.68
  6. Step 6: Final answer
    x = 1,299.07

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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.