Home / 3,990.70-5,507.68-2,289.87

Finding the Fourth Proportional to 3,990.70, 5,507.68 and 2,289.87

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Solution

The fourth proportional to 3,990.70, 5,507.68 and 2,289.87 is: 3,160.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.70 : 5,507.68 = 2,289.87 : x
  2. Step 2: Convert to fraction form
    3,990.70/5,507.68 = 2,289.87/x
  3. Step 3: Cross multiply
    3,990.70x = 5,507.68 × 2,289.87
  4. Step 4: Simplify right side
    3,990.70x = 12,611,871.20
  5. Step 5: Solve for x
    x = 12,611,871.20/3,990.70
  6. Step 6: Final answer
    x = 3,160.32

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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.