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Finding the Fourth Proportional to 8,479.81, 12,704.46 and 7,979.62

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Solution

The fourth proportional to 8,479.81, 12,704.46 and 7,979.62 is: 11,955.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.81 : 12,704.46 = 7,979.62 : x
  2. Step 2: Convert to fraction form
    8,479.81/12,704.46 = 7,979.62/x
  3. Step 3: Cross multiply
    8,479.81x = 12,704.46 × 7,979.62
  4. Step 4: Simplify right side
    8,479.81x = 101,376,763.11
  5. Step 5: Solve for x
    x = 101,376,763.11/8,479.81
  6. Step 6: Final answer
    x = 11,955.07

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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.