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Finding the Fourth Proportional to 8,712.96, 13,069.50 and 2,139.20

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Solution

The fourth proportional to 8,712.96, 13,069.50 and 2,139.20 is: 3,208.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.96 : 13,069.50 = 2,139.20 : x
  2. Step 2: Convert to fraction form
    8,712.96/13,069.50 = 2,139.20/x
  3. Step 3: Cross multiply
    8,712.96x = 13,069.50 × 2,139.20
  4. Step 4: Simplify right side
    8,712.96x = 27,958,274.40
  5. Step 5: Solve for x
    x = 27,958,274.40/8,712.96
  6. Step 6: Final answer
    x = 3,208.81

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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.