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Finding the Fourth Proportional to 8,691.56, 11,991.21 and 5,709

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Solution

The fourth proportional to 8,691.56, 11,991.21 and 5,709 is: 7,876.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.56 : 11,991.21 = 5,709 : x
  2. Step 2: Convert to fraction form
    8,691.56/11,991.21 = 5,709/x
  3. Step 3: Cross multiply
    8,691.56x = 11,991.21 × 5,709
  4. Step 4: Simplify right side
    8,691.56x = 68,457,817.89
  5. Step 5: Solve for x
    x = 68,457,817.89/8,691.56
  6. Step 6: Final answer
    x = 7,876.36

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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.