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Finding the Fourth Proportional to 6,991.20, 9,645.68 and 3,965.82

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Solution

The fourth proportional to 6,991.20, 9,645.68 and 3,965.82 is: 5,471.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,991.20 : 9,645.68 = 3,965.82 : x
  2. Step 2: Convert to fraction form
    6,991.20/9,645.68 = 3,965.82/x
  3. Step 3: Cross multiply
    6,991.20x = 9,645.68 × 3,965.82
  4. Step 4: Simplify right side
    6,991.20x = 38,253,030.66
  5. Step 5: Solve for x
    x = 38,253,030.66/6,991.20
  6. Step 6: Final answer
    x = 5,471.60

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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.