Home / 3,890.79-5,369.40-2,122.43

Finding the Fourth Proportional to 3,890.79, 5,369.40 and 2,122.43

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Solution

The fourth proportional to 3,890.79, 5,369.40 and 2,122.43 is: 2,929.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.79 : 5,369.40 = 2,122.43 : x
  2. Step 2: Convert to fraction form
    3,890.79/5,369.40 = 2,122.43/x
  3. Step 3: Cross multiply
    3,890.79x = 5,369.40 × 2,122.43
  4. Step 4: Simplify right side
    3,890.79x = 11,396,148.80
  5. Step 5: Solve for x
    x = 11,396,148.80/3,890.79
  6. Step 6: Final answer
    x = 2,929.01

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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.