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Finding the Fourth Proportional to 8,712.80, 13,072.40 and 3,519.20

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Solution

The fourth proportional to 8,712.80, 13,072.40 and 3,519.20 is: 5,280.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.80 : 13,072.40 = 3,519.20 : x
  2. Step 2: Convert to fraction form
    8,712.80/13,072.40 = 3,519.20/x
  3. Step 3: Cross multiply
    8,712.80x = 13,072.40 × 3,519.20
  4. Step 4: Simplify right side
    8,712.80x = 46,004,390.08
  5. Step 5: Solve for x
    x = 46,004,390.08/8,712.80
  6. Step 6: Final answer
    x = 5,280.09

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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.