Home / 3,986.40-5,501.34-2,218.20

Finding the Fourth Proportional to 3,986.40, 5,501.34 and 2,218.20

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Solution

The fourth proportional to 3,986.40, 5,501.34 and 2,218.20 is: 3,061.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.40 : 5,501.34 = 2,218.20 : x
  2. Step 2: Convert to fraction form
    3,986.40/5,501.34 = 2,218.20/x
  3. Step 3: Cross multiply
    3,986.40x = 5,501.34 × 2,218.20
  4. Step 4: Simplify right side
    3,986.40x = 12,203,072.39
  5. Step 5: Solve for x
    x = 12,203,072.39/3,986.40
  6. Step 6: Final answer
    x = 3,061.18

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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.