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Finding the Fourth Proportional to 7,218.69, 9,961.82 and 3,906.69

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Solution

The fourth proportional to 7,218.69, 9,961.82 and 3,906.69 is: 5,391.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,218.69 : 9,961.82 = 3,906.69 : x
  2. Step 2: Convert to fraction form
    7,218.69/9,961.82 = 3,906.69/x
  3. Step 3: Cross multiply
    7,218.69x = 9,961.82 × 3,906.69
  4. Step 4: Simplify right side
    7,218.69x = 38,917,742.58
  5. Step 5: Solve for x
    x = 38,917,742.58/7,218.69
  6. Step 6: Final answer
    x = 5,391.25

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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.