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Finding the Fourth Proportional to 6,921, 10,385.82 and 2,817

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Solution

The fourth proportional to 6,921, 10,385.82 and 2,817 is: 4,227.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921 : 10,385.82 = 2,817 : x
  2. Step 2: Convert to fraction form
    6,921/10,385.82 = 2,817/x
  3. Step 3: Cross multiply
    6,921x = 10,385.82 × 2,817
  4. Step 4: Simplify right side
    6,921x = 29,256,854.94
  5. Step 5: Solve for x
    x = 29,256,854.94/6,921
  6. Step 6: Final answer
    x = 4,227.26

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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.