Home / 80,761.21-121,142.31-28,170.75

Finding the Fourth Proportional to 80,761.21, 121,142.31 and 28,170.75

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Solution

The fourth proportional to 80,761.21, 121,142.31 and 28,170.75 is: 42,256.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,761.21 : 121,142.31 = 28,170.75 : x
  2. Step 2: Convert to fraction form
    80,761.21/121,142.31 = 28,170.75/x
  3. Step 3: Cross multiply
    80,761.21x = 121,142.31 × 28,170.75
  4. Step 4: Simplify right side
    80,761.21x = 3,412,669,729.43
  5. Step 5: Solve for x
    x = 3,412,669,729.43/80,761.21
  6. Step 6: Final answer
    x = 42,256.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.