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Finding the Fourth Proportional to 8,979.84, 13,471.20 and 3,138.24

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Solution

The fourth proportional to 8,979.84, 13,471.20 and 3,138.24 is: 4,707.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.84 : 13,471.20 = 3,138.24 : x
  2. Step 2: Convert to fraction form
    8,979.84/13,471.20 = 3,138.24/x
  3. Step 3: Cross multiply
    8,979.84x = 13,471.20 × 3,138.24
  4. Step 4: Simplify right side
    8,979.84x = 42,275,858.69
  5. Step 5: Solve for x
    x = 42,275,858.69/8,979.84
  6. Step 6: Final answer
    x = 4,707.86

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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.