Home / 3,920.78-5,881.75-1,147.12

Finding the Fourth Proportional to 3,920.78, 5,881.75 and 1,147.12

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Solution

The fourth proportional to 3,920.78, 5,881.75 and 1,147.12 is: 1,720.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.78 : 5,881.75 = 1,147.12 : x
  2. Step 2: Convert to fraction form
    3,920.78/5,881.75 = 1,147.12/x
  3. Step 3: Cross multiply
    3,920.78x = 5,881.75 × 1,147.12
  4. Step 4: Simplify right side
    3,920.78x = 6,747,055.49
  5. Step 5: Solve for x
    x = 6,747,055.49/3,920.78
  6. Step 6: Final answer
    x = 1,720.84

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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.