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Finding the Fourth Proportional to 66,375.12, 99,578.64 and 18,990.96

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Solution

The fourth proportional to 66,375.12, 99,578.64 and 18,990.96 is: 28,491.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,375.12 : 99,578.64 = 18,990.96 : x
  2. Step 2: Convert to fraction form
    66,375.12/99,578.64 = 18,990.96/x
  3. Step 3: Cross multiply
    66,375.12x = 99,578.64 × 18,990.96
  4. Step 4: Simplify right side
    66,375.12x = 1,891,093,969.09
  5. Step 5: Solve for x
    x = 1,891,093,969.09/66,375.12
  6. Step 6: Final answer
    x = 28,491.01

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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.