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Finding the Fourth Proportional to 18,785.99, 28,191.28 and 7,099.21

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Solution

The fourth proportional to 18,785.99, 28,191.28 and 7,099.21 is: 10,653.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.99 : 28,191.28 = 7,099.21 : x
  2. Step 2: Convert to fraction form
    18,785.99/28,191.28 = 7,099.21/x
  3. Step 3: Cross multiply
    18,785.99x = 28,191.28 × 7,099.21
  4. Step 4: Simplify right side
    18,785.99x = 200,135,763.70
  5. Step 5: Solve for x
    x = 200,135,763.70/18,785.99
  6. Step 6: Final answer
    x = 10,653.46

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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.