Home / 3,930.80-5,424.51-2,162.40

Finding the Fourth Proportional to 3,930.80, 5,424.51 and 2,162.40

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Solution

The fourth proportional to 3,930.80, 5,424.51 and 2,162.40 is: 2,984.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.80 : 5,424.51 = 2,162.40 : x
  2. Step 2: Convert to fraction form
    3,930.80/5,424.51 = 2,162.40/x
  3. Step 3: Cross multiply
    3,930.80x = 5,424.51 × 2,162.40
  4. Step 4: Simplify right side
    3,930.80x = 11,729,932.99
  5. Step 5: Solve for x
    x = 11,729,932.99/3,930.80
  6. Step 6: Final answer
    x = 2,984.11

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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.