Home / 3,890.40-5,368.71-2,122.01

Finding the Fourth Proportional to 3,890.40, 5,368.71 and 2,122.01

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Solution

The fourth proportional to 3,890.40, 5,368.71 and 2,122.01 is: 2,928.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.40 : 5,368.71 = 2,122.01 : x
  2. Step 2: Convert to fraction form
    3,890.40/5,368.71 = 2,122.01/x
  3. Step 3: Cross multiply
    3,890.40x = 5,368.71 × 2,122.01
  4. Step 4: Simplify right side
    3,890.40x = 11,392,456.31
  5. Step 5: Solve for x
    x = 11,392,456.31/3,890.40
  6. Step 6: Final answer
    x = 2,928.35

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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.