Home / 81,436.20-122,121.90-28,818.60

Finding the Fourth Proportional to 81,436.20, 122,121.90 and 28,818.60

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Solution

The fourth proportional to 81,436.20, 122,121.90 and 28,818.60 is: 43,216.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,436.20 : 122,121.90 = 28,818.60 : x
  2. Step 2: Convert to fraction form
    81,436.20/122,121.90 = 28,818.60/x
  3. Step 3: Cross multiply
    81,436.20x = 122,121.90 × 28,818.60
  4. Step 4: Simplify right side
    81,436.20x = 3,519,382,187.34
  5. Step 5: Solve for x
    x = 3,519,382,187.34/81,436.20
  6. Step 6: Final answer
    x = 43,216.43

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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.