Home / 3,890.83-5,369.29-2,122.40

Finding the Fourth Proportional to 3,890.83, 5,369.29 and 2,122.40

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Solution

The fourth proportional to 3,890.83, 5,369.29 and 2,122.40 is: 2,928.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.83 : 5,369.29 = 2,122.40 : x
  2. Step 2: Convert to fraction form
    3,890.83/5,369.29 = 2,122.40/x
  3. Step 3: Cross multiply
    3,890.83x = 5,369.29 × 2,122.40
  4. Step 4: Simplify right side
    3,890.83x = 11,395,781.10
  5. Step 5: Solve for x
    x = 11,395,781.10/3,890.83
  6. Step 6: Final answer
    x = 2,928.88

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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.