Home / 2,121.80-3,182.70-1,028.30

Finding the Fourth Proportional to 2,121.80, 3,182.70 and 1,028.30

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Solution

The fourth proportional to 2,121.80, 3,182.70 and 1,028.30 is: 1,542.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.80 : 3,182.70 = 1,028.30 : x
  2. Step 2: Convert to fraction form
    2,121.80/3,182.70 = 1,028.30/x
  3. Step 3: Cross multiply
    2,121.80x = 3,182.70 × 1,028.30
  4. Step 4: Simplify right side
    2,121.80x = 3,272,770.41
  5. Step 5: Solve for x
    x = 3,272,770.41/2,121.80
  6. Step 6: Final answer
    x = 1,542.45

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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.