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Finding the Fourth Proportional to 7,218.59, 9,961.66 and 3,906.59

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Solution

The fourth proportional to 7,218.59, 9,961.66 and 3,906.59 is: 5,391.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,218.59 : 9,961.66 = 3,906.59 : x
  2. Step 2: Convert to fraction form
    7,218.59/9,961.66 = 3,906.59/x
  3. Step 3: Cross multiply
    7,218.59x = 9,961.66 × 3,906.59
  4. Step 4: Simplify right side
    7,218.59x = 38,916,158.70
  5. Step 5: Solve for x
    x = 38,916,158.70/7,218.59
  6. Step 6: Final answer
    x = 5,391.10

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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.