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Finding the Fourth Proportional to 8,609.64, 12,913.55 and 3,928.25

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Solution

The fourth proportional to 8,609.64, 12,913.55 and 3,928.25 is: 5,891.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,609.64 : 12,913.55 = 3,928.25 : x
  2. Step 2: Convert to fraction form
    8,609.64/12,913.55 = 3,928.25/x
  3. Step 3: Cross multiply
    8,609.64x = 12,913.55 × 3,928.25
  4. Step 4: Simplify right side
    8,609.64x = 50,727,568.58
  5. Step 5: Solve for x
    x = 50,727,568.58/8,609.64
  6. Step 6: Final answer
    x = 5,891.95

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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.