Home / 3,990.68-5,507.13-2,312.17

Finding the Fourth Proportional to 3,990.68, 5,507.13 and 2,312.17

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Solution

The fourth proportional to 3,990.68, 5,507.13 and 2,312.17 is: 3,190.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.68 : 5,507.13 = 2,312.17 : x
  2. Step 2: Convert to fraction form
    3,990.68/5,507.13 = 2,312.17/x
  3. Step 3: Cross multiply
    3,990.68x = 5,507.13 × 2,312.17
  4. Step 4: Simplify right side
    3,990.68x = 12,733,420.77
  5. Step 5: Solve for x
    x = 12,733,420.77/3,990.68
  6. Step 6: Final answer
    x = 3,190.79

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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.