Home / 3,930.31-5,418.40-3,136.31

Finding the Fourth Proportional to 3,930.31, 5,418.40 and 3,136.31

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Solution

The fourth proportional to 3,930.31, 5,418.40 and 3,136.31 is: 4,323.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.31 : 5,418.40 = 3,136.31 : x
  2. Step 2: Convert to fraction form
    3,930.31/5,418.40 = 3,136.31/x
  3. Step 3: Cross multiply
    3,930.31x = 5,418.40 × 3,136.31
  4. Step 4: Simplify right side
    3,930.31x = 16,993,782.10
  5. Step 5: Solve for x
    x = 16,993,782.10/3,930.31
  6. Step 6: Final answer
    x = 4,323.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.