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Finding the Fourth Proportional to 66,418.90, 91,656.89 and 36,204.48

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Solution

The fourth proportional to 66,418.90, 91,656.89 and 36,204.48 is: 49,961.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,418.90 : 91,656.89 = 36,204.48 : x
  2. Step 2: Convert to fraction form
    66,418.90/91,656.89 = 36,204.48/x
  3. Step 3: Cross multiply
    66,418.90x = 91,656.89 × 36,204.48
  4. Step 4: Simplify right side
    66,418.90x = 3,318,390,040.87
  5. Step 5: Solve for x
    x = 3,318,390,040.87/66,418.90
  6. Step 6: Final answer
    x = 49,961.54

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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.