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Finding the Fourth Proportional to 66,386.22, 91,611.90 and 36,171.90

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Solution

The fourth proportional to 66,386.22, 91,611.90 and 36,171.90 is: 49,916.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,386.22 : 91,611.90 = 36,171.90 : x
  2. Step 2: Convert to fraction form
    66,386.22/91,611.90 = 36,171.90/x
  3. Step 3: Cross multiply
    66,386.22x = 91,611.90 × 36,171.90
  4. Step 4: Simplify right side
    66,386.22x = 3,313,776,485.61
  5. Step 5: Solve for x
    x = 3,313,776,485.61/66,386.22
  6. Step 6: Final answer
    x = 49,916.63

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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.