Home / 3,890.61-5,369.13-2,122.32

Finding the Fourth Proportional to 3,890.61, 5,369.13 and 2,122.32

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Solution

The fourth proportional to 3,890.61, 5,369.13 and 2,122.32 is: 2,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.61 : 5,369.13 = 2,122.32 : x
  2. Step 2: Convert to fraction form
    3,890.61/5,369.13 = 2,122.32/x
  3. Step 3: Cross multiply
    3,890.61x = 5,369.13 × 2,122.32
  4. Step 4: Simplify right side
    3,890.61x = 11,395,011.98
  5. Step 5: Solve for x
    x = 11,395,011.98/3,890.61
  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.