Home / 3,913.80-5,401-2,145.40

Finding the Fourth Proportional to 3,913.80, 5,401 and 2,145.40

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Solution

The fourth proportional to 3,913.80, 5,401 and 2,145.40 is: 2,960.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.80 : 5,401 = 2,145.40 : x
  2. Step 2: Convert to fraction form
    3,913.80/5,401 = 2,145.40/x
  3. Step 3: Cross multiply
    3,913.80x = 5,401 × 2,145.40
  4. Step 4: Simplify right side
    3,913.80x = 11,587,305.40
  5. Step 5: Solve for x
    x = 11,587,305.40/3,913.80
  6. Step 6: Final answer
    x = 2,960.63

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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.