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Finding the Fourth Proportional to 15,791.92, 21,786 and 9,076

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Solution

The fourth proportional to 15,791.92, 21,786 and 9,076 is: 12,520.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.92 : 21,786 = 9,076 : x
  2. Step 2: Convert to fraction form
    15,791.92/21,786 = 9,076/x
  3. Step 3: Cross multiply
    15,791.92x = 21,786 × 9,076
  4. Step 4: Simplify right side
    15,791.92x = 197,729,736
  5. Step 5: Solve for x
    x = 197,729,736/15,791.92
  6. Step 6: Final answer
    x = 12,520.94

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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.