Home / 1,331.33-1,997.21-811.71

Finding the Fourth Proportional to 1,331.33, 1,997.21 and 811.71

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Solution

The fourth proportional to 1,331.33, 1,997.21 and 811.71 is: 1,217.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.33 : 1,997.21 = 811.71 : x
  2. Step 2: Convert to fraction form
    1,331.33/1,997.21 = 811.71/x
  3. Step 3: Cross multiply
    1,331.33x = 1,997.21 × 811.71
  4. Step 4: Simplify right side
    1,331.33x = 1,621,155.33
  5. Step 5: Solve for x
    x = 1,621,155.33/1,331.33
  6. Step 6: Final answer
    x = 1,217.70

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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.