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Finding the Fourth Proportional to 6,659.42, 9,979.90 and 4,189.81

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Solution

The fourth proportional to 6,659.42, 9,979.90 and 4,189.81 is: 6,278.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,659.42 : 9,979.90 = 4,189.81 : x
  2. Step 2: Convert to fraction form
    6,659.42/9,979.90 = 4,189.81/x
  3. Step 3: Cross multiply
    6,659.42x = 9,979.90 × 4,189.81
  4. Step 4: Simplify right side
    6,659.42x = 41,813,904.32
  5. Step 5: Solve for x
    x = 41,813,904.32/6,659.42
  6. Step 6: Final answer
    x = 6,278.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.