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Finding the Fourth Proportional to 6,660.91, 9,990.78 and 6,138.91

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Solution

The fourth proportional to 6,660.91, 9,990.78 and 6,138.91 is: 9,207.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660.91 : 9,990.78 = 6,138.91 : x
  2. Step 2: Convert to fraction form
    6,660.91/9,990.78 = 6,138.91/x
  3. Step 3: Cross multiply
    6,660.91x = 9,990.78 × 6,138.91
  4. Step 4: Simplify right side
    6,660.91x = 61,332,499.25
  5. Step 5: Solve for x
    x = 61,332,499.25/6,660.91
  6. Step 6: Final answer
    x = 9,207.83

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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.