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Finding the Fourth Proportional to 1,872.75, 2,809.11 and 486.09

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Solution

The fourth proportional to 1,872.75, 2,809.11 and 486.09 is: 729.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.75 : 2,809.11 = 486.09 : x
  2. Step 2: Convert to fraction form
    1,872.75/2,809.11 = 486.09/x
  3. Step 3: Cross multiply
    1,872.75x = 2,809.11 × 486.09
  4. Step 4: Simplify right side
    1,872.75x = 1,365,480.28
  5. Step 5: Solve for x
    x = 1,365,480.28/1,872.75
  6. Step 6: Final answer
    x = 729.13

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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.