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Finding the Fourth Proportional to 3,889.88, 5,368.01 and 2,121.45

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Solution

The fourth proportional to 3,889.88, 5,368.01 and 2,121.45 is: 2,927.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.88 : 5,368.01 = 2,121.45 : x
  2. Step 2: Convert to fraction form
    3,889.88/5,368.01 = 2,121.45/x
  3. Step 3: Cross multiply
    3,889.88x = 5,368.01 × 2,121.45
  4. Step 4: Simplify right side
    3,889.88x = 11,387,970.12
  5. Step 5: Solve for x
    x = 11,387,970.12/3,889.88
  6. Step 6: Final answer
    x = 2,927.59

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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.