Home / 3,911.85-5,398.56-2,143.53

Finding the Fourth Proportional to 3,911.85, 5,398.56 and 2,143.53

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Solution

The fourth proportional to 3,911.85, 5,398.56 and 2,143.53 is: 2,958.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.85 : 5,398.56 = 2,143.53 : x
  2. Step 2: Convert to fraction form
    3,911.85/5,398.56 = 2,143.53/x
  3. Step 3: Cross multiply
    3,911.85x = 5,398.56 × 2,143.53
  4. Step 4: Simplify right side
    3,911.85x = 11,571,975.32
  5. Step 5: Solve for x
    x = 11,571,975.32/3,911.85
  6. Step 6: Final answer
    x = 2,958.18

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1.5x scale

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.