Home / 18,815.40-28,234.30-7,129.80

Finding the Fourth Proportional to 18,815.40, 28,234.30 and 7,129.80

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Solution

The fourth proportional to 18,815.40, 28,234.30 and 7,129.80 is: 10,698.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.40 : 28,234.30 = 7,129.80 : x
  2. Step 2: Convert to fraction form
    18,815.40/28,234.30 = 7,129.80/x
  3. Step 3: Cross multiply
    18,815.40x = 28,234.30 × 7,129.80
  4. Step 4: Simplify right side
    18,815.40x = 201,304,912.14
  5. Step 5: Solve for x
    x = 201,304,912.14/18,815.40
  6. Step 6: Final answer
    x = 10,698.94

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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.