Home / 3,620.80-5,420.40-2,159.20

Finding the Fourth Proportional to 3,620.80, 5,420.40 and 2,159.20

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Solution

The fourth proportional to 3,620.80, 5,420.40 and 2,159.20 is: 3,232.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.80 : 5,420.40 = 2,159.20 : x
  2. Step 2: Convert to fraction form
    3,620.80/5,420.40 = 2,159.20/x
  3. Step 3: Cross multiply
    3,620.80x = 5,420.40 × 2,159.20
  4. Step 4: Simplify right side
    3,620.80x = 11,703,727.68
  5. Step 5: Solve for x
    x = 11,703,727.68/3,620.80
  6. Step 6: Final answer
    x = 3,232.36

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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.