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Finding the Fourth Proportional to 7,405.40, 11,105.40 and 2,961.20

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Solution

The fourth proportional to 7,405.40, 11,105.40 and 2,961.20 is: 4,440.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,405.40 : 11,105.40 = 2,961.20 : x
  2. Step 2: Convert to fraction form
    7,405.40/11,105.40 = 2,961.20/x
  3. Step 3: Cross multiply
    7,405.40x = 11,105.40 × 2,961.20
  4. Step 4: Simplify right side
    7,405.40x = 32,885,310.48
  5. Step 5: Solve for x
    x = 32,885,310.48/7,405.40
  6. Step 6: Final answer
    x = 4,440.72

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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.