Home / 3,889.90-5,368.06-2,121.50

Finding the Fourth Proportional to 3,889.90, 5,368.06 and 2,121.50

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Solution

The fourth proportional to 3,889.90, 5,368.06 and 2,121.50 is: 2,927.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.90 : 5,368.06 = 2,121.50 : x
  2. Step 2: Convert to fraction form
    3,889.90/5,368.06 = 2,121.50/x
  3. Step 3: Cross multiply
    3,889.90x = 5,368.06 × 2,121.50
  4. Step 4: Simplify right side
    3,889.90x = 11,388,359.93
  5. Step 5: Solve for x
    x = 11,388,359.93/3,889.90
  6. Step 6: Final answer
    x = 2,927.68

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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.