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Finding the Fourth Proportional to 6,543.78, 9,815.99 and 2,161.14

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Solution

The fourth proportional to 6,543.78, 9,815.99 and 2,161.14 is: 3,241.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,543.78 : 9,815.99 = 2,161.14 : x
  2. Step 2: Convert to fraction form
    6,543.78/9,815.99 = 2,161.14/x
  3. Step 3: Cross multiply
    6,543.78x = 9,815.99 × 2,161.14
  4. Step 4: Simplify right side
    6,543.78x = 21,213,728.63
  5. Step 5: Solve for x
    x = 21,213,728.63/6,543.78
  6. Step 6: Final answer
    x = 3,241.82

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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.