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Finding the Fourth Proportional to 8,620.78, 12,928.35 and 2,776.02

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Solution

The fourth proportional to 8,620.78, 12,928.35 and 2,776.02 is: 4,163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.78 : 12,928.35 = 2,776.02 : x
  2. Step 2: Convert to fraction form
    8,620.78/12,928.35 = 2,776.02/x
  3. Step 3: Cross multiply
    8,620.78x = 12,928.35 × 2,776.02
  4. Step 4: Simplify right side
    8,620.78x = 35,889,293.53
  5. Step 5: Solve for x
    x = 35,889,293.53/8,620.78
  6. Step 6: Final answer
    x = 4,163.12

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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.