Home / 80,972.80-121,459.20-71,131.30

Finding the Fourth Proportional to 80,972.80, 121,459.20 and 71,131.30

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Solution

The fourth proportional to 80,972.80, 121,459.20 and 71,131.30 is: 106,696.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,972.80 : 121,459.20 = 71,131.30 : x
  2. Step 2: Convert to fraction form
    80,972.80/121,459.20 = 71,131.30/x
  3. Step 3: Cross multiply
    80,972.80x = 121,459.20 × 71,131.30
  4. Step 4: Simplify right side
    80,972.80x = 8,639,550,792.96
  5. Step 5: Solve for x
    x = 8,639,550,792.96/80,972.80
  6. Step 6: Final answer
    x = 106,696.95

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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.