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Finding the Fourth Proportional to 10,971.21, 16,455.87 and 8,879.79

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Solution

The fourth proportional to 10,971.21, 16,455.87 and 8,879.79 is: 13,318.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,971.21 : 16,455.87 = 8,879.79 : x
  2. Step 2: Convert to fraction form
    10,971.21/16,455.87 = 8,879.79/x
  3. Step 3: Cross multiply
    10,971.21x = 16,455.87 × 8,879.79
  4. Step 4: Simplify right side
    10,971.21x = 146,124,669.87
  5. Step 5: Solve for x
    x = 146,124,669.87/10,971.21
  6. Step 6: Final answer
    x = 13,318.92

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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.