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Finding the Fourth Proportional to 3,890.79, 5,369.22 and 2,122.38

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Solution

The fourth proportional to 3,890.79, 5,369.22 and 2,122.38 is: 2,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.79 : 5,369.22 = 2,122.38 : x
  2. Step 2: Convert to fraction form
    3,890.79/5,369.22 = 2,122.38/x
  3. Step 3: Cross multiply
    3,890.79x = 5,369.22 × 2,122.38
  4. Step 4: Simplify right side
    3,890.79x = 11,395,525.14
  5. Step 5: Solve for x
    x = 11,395,525.14/3,890.79
  6. Step 6: Final answer
    x = 2,928.85

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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.