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Finding the Fourth Proportional to 2,187.68, 3,282.80 and 820.64

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Solution

The fourth proportional to 2,187.68, 3,282.80 and 820.64 is: 1,231.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.68 : 3,282.80 = 820.64 : x
  2. Step 2: Convert to fraction form
    2,187.68/3,282.80 = 820.64/x
  3. Step 3: Cross multiply
    2,187.68x = 3,282.80 × 820.64
  4. Step 4: Simplify right side
    2,187.68x = 2,693,996.99
  5. Step 5: Solve for x
    x = 2,693,996.99/2,187.68
  6. Step 6: Final answer
    x = 1,231.44

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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.