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Finding the Fourth Proportional to 8,479.70, 12,711.81 and 3,281.66

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Solution

The fourth proportional to 8,479.70, 12,711.81 and 3,281.66 is: 4,919.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.70 : 12,711.81 = 3,281.66 : x
  2. Step 2: Convert to fraction form
    8,479.70/12,711.81 = 3,281.66/x
  3. Step 3: Cross multiply
    8,479.70x = 12,711.81 × 3,281.66
  4. Step 4: Simplify right side
    8,479.70x = 41,715,838.40
  5. Step 5: Solve for x
    x = 41,715,838.40/8,479.70
  6. Step 6: Final answer
    x = 4,919.49

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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.