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Finding the Fourth Proportional to 7,040.64, 9,716.16 and 3,896.64

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Solution

The fourth proportional to 7,040.64, 9,716.16 and 3,896.64 is: 5,377.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,040.64 : 9,716.16 = 3,896.64 : x
  2. Step 2: Convert to fraction form
    7,040.64/9,716.16 = 3,896.64/x
  3. Step 3: Cross multiply
    7,040.64x = 9,716.16 × 3,896.64
  4. Step 4: Simplify right side
    7,040.64x = 37,860,377.70
  5. Step 5: Solve for x
    x = 37,860,377.70/7,040.64
  6. Step 6: Final answer
    x = 5,377.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.