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Finding the Fourth Proportional to 11,969.76, 16,520.24 and 9,131.78

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Solution

The fourth proportional to 11,969.76, 16,520.24 and 9,131.78 is: 12,603.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,969.76 : 16,520.24 = 9,131.78 : x
  2. Step 2: Convert to fraction form
    11,969.76/16,520.24 = 9,131.78/x
  3. Step 3: Cross multiply
    11,969.76x = 16,520.24 × 9,131.78
  4. Step 4: Simplify right side
    11,969.76x = 150,859,261.36
  5. Step 5: Solve for x
    x = 150,859,261.36/11,969.76
  6. Step 6: Final answer
    x = 12,603.36

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Double scale
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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.