Home / 3,918.13-5,407.12-2,149.80

Finding the Fourth Proportional to 3,918.13, 5,407.12 and 2,149.80

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Solution

The fourth proportional to 3,918.13, 5,407.12 and 2,149.80 is: 2,966.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.13 : 5,407.12 = 2,149.80 : x
  2. Step 2: Convert to fraction form
    3,918.13/5,407.12 = 2,149.80/x
  3. Step 3: Cross multiply
    3,918.13x = 5,407.12 × 2,149.80
  4. Step 4: Simplify right side
    3,918.13x = 11,624,208.99
  5. Step 5: Solve for x
    x = 11,624,208.99/3,918.13
  6. Step 6: Final answer
    x = 2,966.78

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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.