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Finding the Fourth Proportional to 120,698.21, 166,701.77 and 79,489.41

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Solution

The fourth proportional to 120,698.21, 166,701.77 and 79,489.41 is: 109,786.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,698.21 : 166,701.77 = 79,489.41 : x
  2. Step 2: Convert to fraction form
    120,698.21/166,701.77 = 79,489.41/x
  3. Step 3: Cross multiply
    120,698.21x = 166,701.77 × 79,489.41
  4. Step 4: Simplify right side
    120,698.21x = 13,251,025,796.31
  5. Step 5: Solve for x
    x = 13,251,025,796.31/120,698.21
  6. Step 6: Final answer
    x = 109,786.43

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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.