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Finding the Fourth Proportional to 66,531.11, 99,817.11 and 39,906.63

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Solution

The fourth proportional to 66,531.11, 99,817.11 and 39,906.63 is: 59,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,531.11 : 99,817.11 = 39,906.63 : x
  2. Step 2: Convert to fraction form
    66,531.11/99,817.11 = 39,906.63/x
  3. Step 3: Cross multiply
    66,531.11x = 99,817.11 × 39,906.63
  4. Step 4: Simplify right side
    66,531.11x = 3,983,364,476.44
  5. Step 5: Solve for x
    x = 3,983,364,476.44/66,531.11
  6. Step 6: Final answer
    x = 59,872.21

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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.