Home / 3,906.12-5,389.99-2,312.80

Finding the Fourth Proportional to 3,906.12, 5,389.99 and 2,312.80

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Solution

The fourth proportional to 3,906.12, 5,389.99 and 2,312.80 is: 3,191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.12 : 5,389.99 = 2,312.80 : x
  2. Step 2: Convert to fraction form
    3,906.12/5,389.99 = 2,312.80/x
  3. Step 3: Cross multiply
    3,906.12x = 5,389.99 × 2,312.80
  4. Step 4: Simplify right side
    3,906.12x = 12,465,992.94
  5. Step 5: Solve for x
    x = 12,465,992.94/3,906.12
  6. Step 6: Final answer
    x = 3,191.40

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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.