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Finding the Fourth Proportional to 6,679.92, 9,216.80 and 3,990.42

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Solution

The fourth proportional to 6,679.92, 9,216.80 and 3,990.42 is: 5,505.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,679.92 : 9,216.80 = 3,990.42 : x
  2. Step 2: Convert to fraction form
    6,679.92/9,216.80 = 3,990.42/x
  3. Step 3: Cross multiply
    6,679.92x = 9,216.80 × 3,990.42
  4. Step 4: Simplify right side
    6,679.92x = 36,778,903.06
  5. Step 5: Solve for x
    x = 36,778,903.06/6,679.92
  6. Step 6: Final answer
    x = 5,505.89

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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.