Home / 2,112.30-3,168.90-813.75

Finding the Fourth Proportional to 2,112.30, 3,168.90 and 813.75

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Solution

The fourth proportional to 2,112.30, 3,168.90 and 813.75 is: 1,220.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.30 : 3,168.90 = 813.75 : x
  2. Step 2: Convert to fraction form
    2,112.30/3,168.90 = 813.75/x
  3. Step 3: Cross multiply
    2,112.30x = 3,168.90 × 813.75
  4. Step 4: Simplify right side
    2,112.30x = 2,578,692.38
  5. Step 5: Solve for x
    x = 2,578,692.38/2,112.30
  6. Step 6: Final answer
    x = 1,220.80

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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.