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Finding the Fourth Proportional to 18,715.70, 28,049.20 and 7,609.43

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Solution

The fourth proportional to 18,715.70, 28,049.20 and 7,609.43 is: 11,404.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.70 : 28,049.20 = 7,609.43 : x
  2. Step 2: Convert to fraction form
    18,715.70/28,049.20 = 7,609.43/x
  3. Step 3: Cross multiply
    18,715.70x = 28,049.20 × 7,609.43
  4. Step 4: Simplify right side
    18,715.70x = 213,438,423.96
  5. Step 5: Solve for x
    x = 213,438,423.96/18,715.70
  6. Step 6: Final answer
    x = 11,404.24

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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.