Home / 80,694.40-121,012.80-28,105.60

Finding the Fourth Proportional to 80,694.40, 121,012.80 and 28,105.60

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Solution

The fourth proportional to 80,694.40, 121,012.80 and 28,105.60 is: 42,148.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,694.40 : 121,012.80 = 28,105.60 : x
  2. Step 2: Convert to fraction form
    80,694.40/121,012.80 = 28,105.60/x
  3. Step 3: Cross multiply
    80,694.40x = 121,012.80 × 28,105.60
  4. Step 4: Simplify right side
    80,694.40x = 3,401,137,351.68
  5. Step 5: Solve for x
    x = 3,401,137,351.68/80,694.40
  6. Step 6: Final answer
    x = 42,148.37

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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.