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Finding the Fourth Proportional to 10,645.76, 15,979.53 and 8,790.96

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Solution

The fourth proportional to 10,645.76, 15,979.53 and 8,790.96 is: 13,195.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,645.76 : 15,979.53 = 8,790.96 : x
  2. Step 2: Convert to fraction form
    10,645.76/15,979.53 = 8,790.96/x
  3. Step 3: Cross multiply
    10,645.76x = 15,979.53 × 8,790.96
  4. Step 4: Simplify right side
    10,645.76x = 140,475,409.05
  5. Step 5: Solve for x
    x = 140,475,409.05/10,645.76
  6. Step 6: Final answer
    x = 13,195.44

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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.