Home / 80,910.32-121,361.70-28,331.60

Finding the Fourth Proportional to 80,910.32, 121,361.70 and 28,331.60

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Solution

The fourth proportional to 80,910.32, 121,361.70 and 28,331.60 is: 42,496.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,910.32 : 121,361.70 = 28,331.60 : x
  2. Step 2: Convert to fraction form
    80,910.32/121,361.70 = 28,331.60/x
  3. Step 3: Cross multiply
    80,910.32x = 121,361.70 × 28,331.60
  4. Step 4: Simplify right side
    80,910.32x = 3,438,371,139.72
  5. Step 5: Solve for x
    x = 3,438,371,139.72/80,910.32
  6. Step 6: Final answer
    x = 42,496.08

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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.