Home / 2,139.20-3,208.80-2,009.60

Finding the Fourth Proportional to 2,139.20, 3,208.80 and 2,009.60

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Solution

The fourth proportional to 2,139.20, 3,208.80 and 2,009.60 is: 3,014.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.20 : 3,208.80 = 2,009.60 : x
  2. Step 2: Convert to fraction form
    2,139.20/3,208.80 = 2,009.60/x
  3. Step 3: Cross multiply
    2,139.20x = 3,208.80 × 2,009.60
  4. Step 4: Simplify right side
    2,139.20x = 6,448,404.48
  5. Step 5: Solve for x
    x = 6,448,404.48/2,139.20
  6. Step 6: Final answer
    x = 3,014.40

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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.