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Finding the Fourth Proportional to 66,380.76, 91,694.97 and 61,656.84

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Solution

The fourth proportional to 66,380.76, 91,694.97 and 61,656.84 is: 85,169.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,380.76 : 91,694.97 = 61,656.84 : x
  2. Step 2: Convert to fraction form
    66,380.76/91,694.97 = 61,656.84/x
  3. Step 3: Cross multiply
    66,380.76x = 91,694.97 × 61,656.84
  4. Step 4: Simplify right side
    66,380.76x = 5,653,622,094.09
  5. Step 5: Solve for x
    x = 5,653,622,094.09/66,380.76
  6. Step 6: Final answer
    x = 85,169.59

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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.