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Finding the Fourth Proportional to 8,611.76, 12,920.36 and 3,931.58

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Solution

The fourth proportional to 8,611.76, 12,920.36 and 3,931.58 is: 5,898.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.76 : 12,920.36 = 3,931.58 : x
  2. Step 2: Convert to fraction form
    8,611.76/12,920.36 = 3,931.58/x
  3. Step 3: Cross multiply
    8,611.76x = 12,920.36 × 3,931.58
  4. Step 4: Simplify right side
    8,611.76x = 50,797,344.71
  5. Step 5: Solve for x
    x = 50,797,344.71/8,611.76
  6. Step 6: Final answer
    x = 5,898.61

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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.