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Finding the Fourth Proportional to 8,791.28, 12,131.49 and 4,811.62

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Solution

The fourth proportional to 8,791.28, 12,131.49 and 4,811.62 is: 6,639.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,791.28 : 12,131.49 = 4,811.62 : x
  2. Step 2: Convert to fraction form
    8,791.28/12,131.49 = 4,811.62/x
  3. Step 3: Cross multiply
    8,791.28x = 12,131.49 × 4,811.62
  4. Step 4: Simplify right side
    8,791.28x = 58,372,119.91
  5. Step 5: Solve for x
    x = 58,372,119.91/8,791.28
  6. Step 6: Final answer
    x = 6,639.77

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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.