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Finding the Fourth Proportional to 18,757.89, 28,128.16 and 6,908.67

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Solution

The fourth proportional to 18,757.89, 28,128.16 and 6,908.67 is: 10,359.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,757.89 : 28,128.16 = 6,908.67 : x
  2. Step 2: Convert to fraction form
    18,757.89/28,128.16 = 6,908.67/x
  3. Step 3: Cross multiply
    18,757.89x = 28,128.16 × 6,908.67
  4. Step 4: Simplify right side
    18,757.89x = 194,328,175.15
  5. Step 5: Solve for x
    x = 194,328,175.15/18,757.89
  6. Step 6: Final answer
    x = 10,359.81

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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.