Home / 2,791.78-4,189.05-1,311.12

Finding the Fourth Proportional to 2,791.78, 4,189.05 and 1,311.12

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Solution

The fourth proportional to 2,791.78, 4,189.05 and 1,311.12 is: 1,967.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.78 : 4,189.05 = 1,311.12 : x
  2. Step 2: Convert to fraction form
    2,791.78/4,189.05 = 1,311.12/x
  3. Step 3: Cross multiply
    2,791.78x = 4,189.05 × 1,311.12
  4. Step 4: Simplify right side
    2,791.78x = 5,492,347.24
  5. Step 5: Solve for x
    x = 5,492,347.24/2,791.78
  6. Step 6: Final answer
    x = 1,967.33

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1.5x scale

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.