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Finding the Fourth Proportional to 66,397.45, 91,621.92 and 39,172.96

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Solution

The fourth proportional to 66,397.45, 91,621.92 and 39,172.96 is: 54,054.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,397.45 : 91,621.92 = 39,172.96 : x
  2. Step 2: Convert to fraction form
    66,397.45/91,621.92 = 39,172.96/x
  3. Step 3: Cross multiply
    66,397.45x = 91,621.92 × 39,172.96
  4. Step 4: Simplify right side
    66,397.45x = 3,589,101,807.28
  5. Step 5: Solve for x
    x = 3,589,101,807.28/66,397.45
  6. Step 6: Final answer
    x = 54,054.81

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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.