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Finding the Fourth Proportional to 2,813.40, 4,218.84 and 865.80

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Solution

The fourth proportional to 2,813.40, 4,218.84 and 865.80 is: 1,298.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,813.40 : 4,218.84 = 865.80 : x
  2. Step 2: Convert to fraction form
    2,813.40/4,218.84 = 865.80/x
  3. Step 3: Cross multiply
    2,813.40x = 4,218.84 × 865.80
  4. Step 4: Simplify right side
    2,813.40x = 3,652,671.67
  5. Step 5: Solve for x
    x = 3,652,671.67/2,813.40
  6. Step 6: Final answer
    x = 1,298.31

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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.