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Finding the Fourth Proportional to 7,191.40, 10,811.40 and 6,122.20

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Solution

The fourth proportional to 7,191.40, 10,811.40 and 6,122.20 is: 9,203.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,191.40 : 10,811.40 = 6,122.20 : x
  2. Step 2: Convert to fraction form
    7,191.40/10,811.40 = 6,122.20/x
  3. Step 3: Cross multiply
    7,191.40x = 10,811.40 × 6,122.20
  4. Step 4: Simplify right side
    7,191.40x = 66,189,553.08
  5. Step 5: Solve for x
    x = 66,189,553.08/7,191.40
  6. Step 6: Final answer
    x = 9,203.99

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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.