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Finding the Fourth Proportional to 2,808.39, 4,209.17 and 1,986.90

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Solution

The fourth proportional to 2,808.39, 4,209.17 and 1,986.90 is: 2,977.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,808.39 : 4,209.17 = 1,986.90 : x
  2. Step 2: Convert to fraction form
    2,808.39/4,209.17 = 1,986.90/x
  3. Step 3: Cross multiply
    2,808.39x = 4,209.17 × 1,986.90
  4. Step 4: Simplify right side
    2,808.39x = 8,363,179.42
  5. Step 5: Solve for x
    x = 8,363,179.42/2,808.39
  6. Step 6: Final answer
    x = 2,977.93

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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.