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Finding the Fourth Proportional to 12,568.40, 18,809.40 and 8,680.40

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Solution

The fourth proportional to 12,568.40, 18,809.40 and 8,680.40 is: 12,990.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,568.40 : 18,809.40 = 8,680.40 : x
  2. Step 2: Convert to fraction form
    12,568.40/18,809.40 = 8,680.40/x
  3. Step 3: Cross multiply
    12,568.40x = 18,809.40 × 8,680.40
  4. Step 4: Simplify right side
    12,568.40x = 163,273,115.76
  5. Step 5: Solve for x
    x = 163,273,115.76/12,568.40
  6. Step 6: Final answer
    x = 12,990.76

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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.