Home / 1,780.20-2,668.41-684.09

Finding the Fourth Proportional to 1,780.20, 2,668.41 and 684.09

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Solution

The fourth proportional to 1,780.20, 2,668.41 and 684.09 is: 1,025.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.20 : 2,668.41 = 684.09 : x
  2. Step 2: Convert to fraction form
    1,780.20/2,668.41 = 684.09/x
  3. Step 3: Cross multiply
    1,780.20x = 2,668.41 × 684.09
  4. Step 4: Simplify right side
    1,780.20x = 1,825,432.60
  5. Step 5: Solve for x
    x = 1,825,432.60/1,780.20
  6. Step 6: Final answer
    x = 1,025.41

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1.5x scale

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.