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Finding the Fourth Proportional to 66,435.89, 91,680.29 and 36,221.47

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Solution

The fourth proportional to 66,435.89, 91,680.29 and 36,221.47 is: 49,984.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,435.89 : 91,680.29 = 36,221.47 : x
  2. Step 2: Convert to fraction form
    66,435.89/91,680.29 = 36,221.47/x
  3. Step 3: Cross multiply
    66,435.89x = 91,680.29 × 36,221.47
  4. Step 4: Simplify right side
    66,435.89x = 3,320,794,783.27
  5. Step 5: Solve for x
    x = 3,320,794,783.27/66,435.89
  6. Step 6: Final answer
    x = 49,984.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.