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Finding the Fourth Proportional to 8,618.87, 12,928.74 and 2,378.74

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Solution

The fourth proportional to 8,618.87, 12,928.74 and 2,378.74 is: 3,568.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.87 : 12,928.74 = 2,378.74 : x
  2. Step 2: Convert to fraction form
    8,618.87/12,928.74 = 2,378.74/x
  3. Step 3: Cross multiply
    8,618.87x = 12,928.74 × 2,378.74
  4. Step 4: Simplify right side
    8,618.87x = 30,754,137.04
  5. Step 5: Solve for x
    x = 30,754,137.04/8,618.87
  6. Step 6: Final answer
    x = 3,568.23

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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.