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Finding the Fourth Proportional to 66,611.74, 91,921.35 and 36,396.58

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Solution

The fourth proportional to 66,611.74, 91,921.35 and 36,396.58 is: 50,225.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,611.74 : 91,921.35 = 36,396.58 : x
  2. Step 2: Convert to fraction form
    66,611.74/91,921.35 = 36,396.58/x
  3. Step 3: Cross multiply
    66,611.74x = 91,921.35 × 36,396.58
  4. Step 4: Simplify right side
    66,611.74x = 3,345,622,768.98
  5. Step 5: Solve for x
    x = 3,345,622,768.98/66,611.74
  6. Step 6: Final answer
    x = 50,225.72

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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.