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Finding the Fourth Proportional to 66,317.87, 99,489.11 and 21,945

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Solution

The fourth proportional to 66,317.87, 99,489.11 and 21,945 is: 32,921.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,317.87 : 99,489.11 = 21,945 : x
  2. Step 2: Convert to fraction form
    66,317.87/99,489.11 = 21,945/x
  3. Step 3: Cross multiply
    66,317.87x = 99,489.11 × 21,945
  4. Step 4: Simplify right side
    66,317.87x = 2,183,288,518.95
  5. Step 5: Solve for x
    x = 2,183,288,518.95/66,317.87
  6. Step 6: Final answer
    x = 32,921.57

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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.