Home / 12,787.31-19,179.62-3,428.31

Finding the Fourth Proportional to 12,787.31, 19,179.62 and 3,428.31

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Solution

The fourth proportional to 12,787.31, 19,179.62 and 3,428.31 is: 5,142.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,787.31 : 19,179.62 = 3,428.31 : x
  2. Step 2: Convert to fraction form
    12,787.31/19,179.62 = 3,428.31/x
  3. Step 3: Cross multiply
    12,787.31x = 19,179.62 × 3,428.31
  4. Step 4: Simplify right side
    12,787.31x = 65,753,683.04
  5. Step 5: Solve for x
    x = 65,753,683.04/12,787.31
  6. Step 6: Final answer
    x = 5,142.10

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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.