Home / 1,372.21-2,057.40-721.58

Finding the Fourth Proportional to 1,372.21, 2,057.40 and 721.58

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Solution

The fourth proportional to 1,372.21, 2,057.40 and 721.58 is: 1,081.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.21 : 2,057.40 = 721.58 : x
  2. Step 2: Convert to fraction form
    1,372.21/2,057.40 = 721.58/x
  3. Step 3: Cross multiply
    1,372.21x = 2,057.40 × 721.58
  4. Step 4: Simplify right side
    1,372.21x = 1,484,568.41
  5. Step 5: Solve for x
    x = 1,484,568.41/1,372.21
  6. Step 6: Final answer
    x = 1,081.88

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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.