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Finding the Fourth Proportional to 7,105.68, 9,805.68 and 3,961.80

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Solution

The fourth proportional to 7,105.68, 9,805.68 and 3,961.80 is: 5,467.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,105.68 : 9,805.68 = 3,961.80 : x
  2. Step 2: Convert to fraction form
    7,105.68/9,805.68 = 3,961.80/x
  3. Step 3: Cross multiply
    7,105.68x = 9,805.68 × 3,961.80
  4. Step 4: Simplify right side
    7,105.68x = 38,848,143.02
  5. Step 5: Solve for x
    x = 38,848,143.02/7,105.68
  6. Step 6: Final answer
    x = 5,467.20

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1.5x scale

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.