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Finding the Fourth Proportional to 12,689.82, 19,033.92 and 3,924

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Solution

The fourth proportional to 12,689.82, 19,033.92 and 3,924 is: 5,885.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.82 : 19,033.92 = 3,924 : x
  2. Step 2: Convert to fraction form
    12,689.82/19,033.92 = 3,924/x
  3. Step 3: Cross multiply
    12,689.82x = 19,033.92 × 3,924
  4. Step 4: Simplify right side
    12,689.82x = 74,689,102.08
  5. Step 5: Solve for x
    x = 74,689,102.08/12,689.82
  6. Step 6: Final answer
    x = 5,885.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.