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Finding the Fourth Proportional to 21,591.72, 32,388.38 and 7,740.72

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Solution

The fourth proportional to 21,591.72, 32,388.38 and 7,740.72 is: 11,611.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,591.72 : 32,388.38 = 7,740.72 : x
  2. Step 2: Convert to fraction form
    21,591.72/32,388.38 = 7,740.72/x
  3. Step 3: Cross multiply
    21,591.72x = 32,388.38 × 7,740.72
  4. Step 4: Simplify right side
    21,591.72x = 250,709,380.83
  5. Step 5: Solve for x
    x = 250,709,380.83/21,591.72
  6. Step 6: Final answer
    x = 11,611.37

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