Home / 2,121.40-3,179.67-1,145.46

Finding the Fourth Proportional to 2,121.40, 3,179.67 and 1,145.46

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Solution

The fourth proportional to 2,121.40, 3,179.67 and 1,145.46 is: 1,716.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.40 : 3,179.67 = 1,145.46 : x
  2. Step 2: Convert to fraction form
    2,121.40/3,179.67 = 1,145.46/x
  3. Step 3: Cross multiply
    2,121.40x = 3,179.67 × 1,145.46
  4. Step 4: Simplify right side
    2,121.40x = 3,642,184.80
  5. Step 5: Solve for x
    x = 3,642,184.80/2,121.40
  6. Step 6: Final answer
    x = 1,716.88

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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.