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Finding the Fourth Proportional to 120,391.86, 166,135.88 and 66,673.68

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Solution

The fourth proportional to 120,391.86, 166,135.88 and 66,673.68 is: 92,006.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,391.86 : 166,135.88 = 66,673.68 : x
  2. Step 2: Convert to fraction form
    120,391.86/166,135.88 = 66,673.68/x
  3. Step 3: Cross multiply
    120,391.86x = 166,135.88 × 66,673.68
  4. Step 4: Simplify right side
    120,391.86x = 11,076,890,499.64
  5. Step 5: Solve for x
    x = 11,076,890,499.64/120,391.86
  6. Step 6: Final answer
    x = 92,006.97

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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.