Home / 3,889.90-5,368.17-2,121.62

Finding the Fourth Proportional to 3,889.90, 5,368.17 and 2,121.62

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Solution

The fourth proportional to 3,889.90, 5,368.17 and 2,121.62 is: 2,927.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.90 : 5,368.17 = 2,121.62 : x
  2. Step 2: Convert to fraction form
    3,889.90/5,368.17 = 2,121.62/x
  3. Step 3: Cross multiply
    3,889.90x = 5,368.17 × 2,121.62
  4. Step 4: Simplify right side
    3,889.90x = 11,389,213.05
  5. Step 5: Solve for x
    x = 11,389,213.05/3,889.90
  6. Step 6: Final answer
    x = 2,927.89

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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.