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Finding the Fourth Proportional to 11,691.40, 16,129.94 and 6,910.34

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Solution

The fourth proportional to 11,691.40, 16,129.94 and 6,910.34 is: 9,533.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,691.40 : 16,129.94 = 6,910.34 : x
  2. Step 2: Convert to fraction form
    11,691.40/16,129.94 = 6,910.34/x
  3. Step 3: Cross multiply
    11,691.40x = 16,129.94 × 6,910.34
  4. Step 4: Simplify right side
    11,691.40x = 111,463,369.58
  5. Step 5: Solve for x
    x = 111,463,369.58/11,691.40
  6. Step 6: Final answer
    x = 9,533.79

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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.