Home / 2,181.40-3,270-1,399.21

Finding the Fourth Proportional to 2,181.40, 3,270 and 1,399.21

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Solution

The fourth proportional to 2,181.40, 3,270 and 1,399.21 is: 2,097.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181.40 : 3,270 = 1,399.21 : x
  2. Step 2: Convert to fraction form
    2,181.40/3,270 = 1,399.21/x
  3. Step 3: Cross multiply
    2,181.40x = 3,270 × 1,399.21
  4. Step 4: Simplify right side
    2,181.40x = 4,575,416.70
  5. Step 5: Solve for x
    x = 4,575,416.70/2,181.40
  6. Step 6: Final answer
    x = 2,097.47

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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.