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Finding the Fourth Proportional to 2,139.44, 3,209 and 1,273

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Solution

The fourth proportional to 2,139.44, 3,209 and 1,273 is: 1,909.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.44 : 3,209 = 1,273 : x
  2. Step 2: Convert to fraction form
    2,139.44/3,209 = 1,273/x
  3. Step 3: Cross multiply
    2,139.44x = 3,209 × 1,273
  4. Step 4: Simplify right side
    2,139.44x = 4,085,057
  5. Step 5: Solve for x
    x = 4,085,057/2,139.44
  6. Step 6: Final answer
    x = 1,909.40

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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.