Home / 3,890.81-5,369.31-2,122.41

Finding the Fourth Proportional to 3,890.81, 5,369.31 and 2,122.41

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Solution

The fourth proportional to 3,890.81, 5,369.31 and 2,122.41 is: 2,928.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.81 : 5,369.31 = 2,122.41 : x
  2. Step 2: Convert to fraction form
    3,890.81/5,369.31 = 2,122.41/x
  3. Step 3: Cross multiply
    3,890.81x = 5,369.31 × 2,122.41
  4. Step 4: Simplify right side
    3,890.81x = 11,395,877.24
  5. Step 5: Solve for x
    x = 11,395,877.24/3,890.81
  6. Step 6: Final answer
    x = 2,928.92

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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.