Home / 1,851.74-2,778.38-811.20

Finding the Fourth Proportional to 1,851.74, 2,778.38 and 811.20

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Solution

The fourth proportional to 1,851.74, 2,778.38 and 811.20 is: 1,217.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,851.74 : 2,778.38 = 811.20 : x
  2. Step 2: Convert to fraction form
    1,851.74/2,778.38 = 811.20/x
  3. Step 3: Cross multiply
    1,851.74x = 2,778.38 × 811.20
  4. Step 4: Simplify right side
    1,851.74x = 2,253,820.84
  5. Step 5: Solve for x
    x = 2,253,820.84/1,851.74
  6. Step 6: Final answer
    x = 1,217.14

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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.