Home / 11,511.27-15,890.90-8,679.79

Finding the Fourth Proportional to 11,511.27, 15,890.90 and 8,679.79

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Solution

The fourth proportional to 11,511.27, 15,890.90 and 8,679.79 is: 11,982.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,511.27 : 15,890.90 = 8,679.79 : x
  2. Step 2: Convert to fraction form
    11,511.27/15,890.90 = 8,679.79/x
  3. Step 3: Cross multiply
    11,511.27x = 15,890.90 × 8,679.79
  4. Step 4: Simplify right side
    11,511.27x = 137,929,674.91
  5. Step 5: Solve for x
    x = 137,929,674.91/11,511.27
  6. Step 6: Final answer
    x = 11,982.14

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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.