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Finding the Fourth Proportional to 7,691.76, 11,528.28 and 3,991.98

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Solution

The fourth proportional to 7,691.76, 11,528.28 and 3,991.98 is: 5,983.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,691.76 : 11,528.28 = 3,991.98 : x
  2. Step 2: Convert to fraction form
    7,691.76/11,528.28 = 3,991.98/x
  3. Step 3: Cross multiply
    7,691.76x = 11,528.28 × 3,991.98
  4. Step 4: Simplify right side
    7,691.76x = 46,020,663.19
  5. Step 5: Solve for x
    x = 46,020,663.19/7,691.76
  6. Step 6: Final answer
    x = 5,983.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.