Home / 3,917.40-5,406.21-2,149.17

Finding the Fourth Proportional to 3,917.40, 5,406.21 and 2,149.17

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Solution

The fourth proportional to 3,917.40, 5,406.21 and 2,149.17 is: 2,965.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,917.40 : 5,406.21 = 2,149.17 : x
  2. Step 2: Convert to fraction form
    3,917.40/5,406.21 = 2,149.17/x
  3. Step 3: Cross multiply
    3,917.40x = 5,406.21 × 2,149.17
  4. Step 4: Simplify right side
    3,917.40x = 11,618,864.35
  5. Step 5: Solve for x
    x = 11,618,864.35/3,917.40
  6. Step 6: Final answer
    x = 2,965.96

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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.