Home / 2,261.67-3,121.29-1,317.78

Finding the Fourth Proportional to 2,261.67, 3,121.29 and 1,317.78

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Solution

The fourth proportional to 2,261.67, 3,121.29 and 1,317.78 is: 1,818.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,261.67 : 3,121.29 = 1,317.78 : x
  2. Step 2: Convert to fraction form
    2,261.67/3,121.29 = 1,317.78/x
  3. Step 3: Cross multiply
    2,261.67x = 3,121.29 × 1,317.78
  4. Step 4: Simplify right side
    2,261.67x = 4,113,173.54
  5. Step 5: Solve for x
    x = 4,113,173.54/2,261.67
  6. Step 6: Final answer
    x = 1,818.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.