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Finding the Fourth Proportional to 120,390.86, 166,134.50 and 66,672.68

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Solution

The fourth proportional to 120,390.86, 166,134.50 and 66,672.68 is: 92,005.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,390.86 : 166,134.50 = 66,672.68 : x
  2. Step 2: Convert to fraction form
    120,390.86/166,134.50 = 66,672.68/x
  3. Step 3: Cross multiply
    120,390.86x = 166,134.50 × 66,672.68
  4. Step 4: Simplify right side
    120,390.86x = 11,076,632,355.46
  5. Step 5: Solve for x
    x = 11,076,632,355.46/120,390.86
  6. Step 6: Final answer
    x = 92,005.59

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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.