Home / 3,890.48-5,368.85-2,122.09

Finding the Fourth Proportional to 3,890.48, 5,368.85 and 2,122.09

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Solution

The fourth proportional to 3,890.48, 5,368.85 and 2,122.09 is: 2,928.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.48 : 5,368.85 = 2,122.09 : x
  2. Step 2: Convert to fraction form
    3,890.48/5,368.85 = 2,122.09/x
  3. Step 3: Cross multiply
    3,890.48x = 5,368.85 × 2,122.09
  4. Step 4: Simplify right side
    3,890.48x = 11,393,158.86
  5. Step 5: Solve for x
    x = 11,393,158.86/3,890.48
  6. Step 6: Final answer
    x = 2,928.47

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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.