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Finding the Fourth Proportional to 11,687.68, 16,128.29 and 6,381.42

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Solution

The fourth proportional to 11,687.68, 16,128.29 and 6,381.42 is: 8,805.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,687.68 : 16,128.29 = 6,381.42 : x
  2. Step 2: Convert to fraction form
    11,687.68/16,128.29 = 6,381.42/x
  3. Step 3: Cross multiply
    11,687.68x = 16,128.29 × 6,381.42
  4. Step 4: Simplify right side
    11,687.68x = 102,921,392.37
  5. Step 5: Solve for x
    x = 102,921,392.37/11,687.68
  6. Step 6: Final answer
    x = 8,805.97

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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.