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Finding the Fourth Proportional to 18,679.56, 28,019.91 and 6,990.54

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Solution

The fourth proportional to 18,679.56, 28,019.91 and 6,990.54 is: 10,486.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.56 : 28,019.91 = 6,990.54 : x
  2. Step 2: Convert to fraction form
    18,679.56/28,019.91 = 6,990.54/x
  3. Step 3: Cross multiply
    18,679.56x = 28,019.91 × 6,990.54
  4. Step 4: Simplify right side
    18,679.56x = 195,874,301.65
  5. Step 5: Solve for x
    x = 195,874,301.65/18,679.56
  6. Step 6: Final answer
    x = 10,486.02

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1.5x scale

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.