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Finding the Fourth Proportional to 8,620, 12,928.92 and 3,938.64

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Solution

The fourth proportional to 8,620, 12,928.92 and 3,938.64 is: 5,907.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620 : 12,928.92 = 3,938.64 : x
  2. Step 2: Convert to fraction form
    8,620/12,928.92 = 3,938.64/x
  3. Step 3: Cross multiply
    8,620x = 12,928.92 × 3,938.64
  4. Step 4: Simplify right side
    8,620x = 50,922,361.47
  5. Step 5: Solve for x
    x = 50,922,361.47/8,620
  6. Step 6: Final answer
    x = 5,907.47

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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.