Home / 3,890.78-5,369.21-2,122.35

Finding the Fourth Proportional to 3,890.78, 5,369.21 and 2,122.35

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Solution

The fourth proportional to 3,890.78, 5,369.21 and 2,122.35 is: 2,928.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.78 : 5,369.21 = 2,122.35 : x
  2. Step 2: Convert to fraction form
    3,890.78/5,369.21 = 2,122.35/x
  3. Step 3: Cross multiply
    3,890.78x = 5,369.21 × 2,122.35
  4. Step 4: Simplify right side
    3,890.78x = 11,395,305.39
  5. Step 5: Solve for x
    x = 11,395,305.39/3,890.78
  6. Step 6: Final answer
    x = 2,928.80

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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.