Home / 3,885.20-5,361.56-2,116.80

Finding the Fourth Proportional to 3,885.20, 5,361.56 and 2,116.80

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Solution

The fourth proportional to 3,885.20, 5,361.56 and 2,116.80 is: 2,921.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,885.20 : 5,361.56 = 2,116.80 : x
  2. Step 2: Convert to fraction form
    3,885.20/5,361.56 = 2,116.80/x
  3. Step 3: Cross multiply
    3,885.20x = 5,361.56 × 2,116.80
  4. Step 4: Simplify right side
    3,885.20x = 11,349,350.21
  5. Step 5: Solve for x
    x = 11,349,350.21/3,885.20
  6. Step 6: Final answer
    x = 2,921.18

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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.