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Finding the Fourth Proportional to 8,482.72, 12,720.03 and 2,639.38

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Solution

The fourth proportional to 8,482.72, 12,720.03 and 2,639.38 is: 3,957.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,482.72 : 12,720.03 = 2,639.38 : x
  2. Step 2: Convert to fraction form
    8,482.72/12,720.03 = 2,639.38/x
  3. Step 3: Cross multiply
    8,482.72x = 12,720.03 × 2,639.38
  4. Step 4: Simplify right side
    8,482.72x = 33,572,992.78
  5. Step 5: Solve for x
    x = 33,572,992.78/8,482.72
  6. Step 6: Final answer
    x = 3,957.81

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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.