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Finding the Fourth Proportional to 216,531.07, 324,781.04 and 66,755.75

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Solution

The fourth proportional to 216,531.07, 324,781.04 and 66,755.75 is: 100,128.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,531.07 : 324,781.04 = 66,755.75 : x
  2. Step 2: Convert to fraction form
    216,531.07/324,781.04 = 66,755.75/x
  3. Step 3: Cross multiply
    216,531.07x = 324,781.04 × 66,755.75
  4. Step 4: Simplify right side
    216,531.07x = 21,681,000,453.96
  5. Step 5: Solve for x
    x = 21,681,000,453.96/216,531.07
  6. Step 6: Final answer
    x = 100,128.82

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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.