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Finding the Fourth Proportional to 66,401.78, 91,631.76 and 36,186.44

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Solution

The fourth proportional to 66,401.78, 91,631.76 and 36,186.44 is: 49,935.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,401.78 : 91,631.76 = 36,186.44 : x
  2. Step 2: Convert to fraction form
    66,401.78/91,631.76 = 36,186.44/x
  3. Step 3: Cross multiply
    66,401.78x = 91,631.76 × 36,186.44
  4. Step 4: Simplify right side
    66,401.78x = 3,315,826,727.18
  5. Step 5: Solve for x
    x = 3,315,826,727.18/66,401.78
  6. Step 6: Final answer
    x = 49,935.81

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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.