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Finding the Fourth Proportional to 7,429.20, 11,122.20 and 7,040.40

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Solution

The fourth proportional to 7,429.20, 11,122.20 and 7,040.40 is: 10,540.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,429.20 : 11,122.20 = 7,040.40 : x
  2. Step 2: Convert to fraction form
    7,429.20/11,122.20 = 7,040.40/x
  3. Step 3: Cross multiply
    7,429.20x = 11,122.20 × 7,040.40
  4. Step 4: Simplify right side
    7,429.20x = 78,304,736.88
  5. Step 5: Solve for x
    x = 78,304,736.88/7,429.20
  6. Step 6: Final answer
    x = 10,540.13

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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.