Home / 81,919.74-122,909.20-28,619.59

Finding the Fourth Proportional to 81,919.74, 122,909.20 and 28,619.59

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Solution

The fourth proportional to 81,919.74, 122,909.20 and 28,619.59 is: 42,939.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,919.74 : 122,909.20 = 28,619.59 : x
  2. Step 2: Convert to fraction form
    81,919.74/122,909.20 = 28,619.59/x
  3. Step 3: Cross multiply
    81,919.74x = 122,909.20 × 28,619.59
  4. Step 4: Simplify right side
    81,919.74x = 3,517,610,153.58
  5. Step 5: Solve for x
    x = 3,517,610,153.58/81,919.74
  6. Step 6: Final answer
    x = 42,939.71

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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.