Home / 2,189.20-3,281.40-1,148.80

Finding the Fourth Proportional to 2,189.20, 3,281.40 and 1,148.80

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Solution

The fourth proportional to 2,189.20, 3,281.40 and 1,148.80 is: 1,721.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.20 : 3,281.40 = 1,148.80 : x
  2. Step 2: Convert to fraction form
    2,189.20/3,281.40 = 1,148.80/x
  3. Step 3: Cross multiply
    2,189.20x = 3,281.40 × 1,148.80
  4. Step 4: Simplify right side
    2,189.20x = 3,769,672.32
  5. Step 5: Solve for x
    x = 3,769,672.32/2,189.20
  6. Step 6: Final answer
    x = 1,721.94

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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.