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Finding the Fourth Proportional to 18,871.92, 28,306.44 and 5,724.36

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Solution

The fourth proportional to 18,871.92, 28,306.44 and 5,724.36 is: 8,586.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.92 : 28,306.44 = 5,724.36 : x
  2. Step 2: Convert to fraction form
    18,871.92/28,306.44 = 5,724.36/x
  3. Step 3: Cross multiply
    18,871.92x = 28,306.44 × 5,724.36
  4. Step 4: Simplify right side
    18,871.92x = 162,036,252.88
  5. Step 5: Solve for x
    x = 162,036,252.88/18,871.92
  6. Step 6: Final answer
    x = 8,586.10

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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.