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Finding the Fourth Proportional to 7,385.28, 11,078.28 and 2,191.20

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Solution

The fourth proportional to 7,385.28, 11,078.28 and 2,191.20 is: 3,286.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,385.28 : 11,078.28 = 2,191.20 : x
  2. Step 2: Convert to fraction form
    7,385.28/11,078.28 = 2,191.20/x
  3. Step 3: Cross multiply
    7,385.28x = 11,078.28 × 2,191.20
  4. Step 4: Simplify right side
    7,385.28x = 24,274,727.14
  5. Step 5: Solve for x
    x = 24,274,727.14/7,385.28
  6. Step 6: Final answer
    x = 3,286.91

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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.