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Finding the Fourth Proportional to 13,616.87, 18,789.08 and 8,511.79

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Solution

The fourth proportional to 13,616.87, 18,789.08 and 8,511.79 is: 11,744.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,616.87 : 18,789.08 = 8,511.79 : x
  2. Step 2: Convert to fraction form
    13,616.87/18,789.08 = 8,511.79/x
  3. Step 3: Cross multiply
    13,616.87x = 18,789.08 × 8,511.79
  4. Step 4: Simplify right side
    13,616.87x = 159,928,613.72
  5. Step 5: Solve for x
    x = 159,928,613.72/13,616.87
  6. Step 6: Final answer
    x = 11,744.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.