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Finding the Fourth Proportional to 6,679.99, 9,218.78 and 3,992.41

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Solution

The fourth proportional to 6,679.99, 9,218.78 and 3,992.41 is: 5,509.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,679.99 : 9,218.78 = 3,992.41 : x
  2. Step 2: Convert to fraction form
    6,679.99/9,218.78 = 3,992.41/x
  3. Step 3: Cross multiply
    6,679.99x = 9,218.78 × 3,992.41
  4. Step 4: Simplify right side
    6,679.99x = 36,805,149.46
  5. Step 5: Solve for x
    x = 36,805,149.46/6,679.99
  6. Step 6: Final answer
    x = 5,509.76

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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.