Home / 81,410.20-122,115.30-66,635.80

Finding the Fourth Proportional to 81,410.20, 122,115.30 and 66,635.80

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Solution

The fourth proportional to 81,410.20, 122,115.30 and 66,635.80 is: 99,953.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,410.20 : 122,115.30 = 66,635.80 : x
  2. Step 2: Convert to fraction form
    81,410.20/122,115.30 = 66,635.80/x
  3. Step 3: Cross multiply
    81,410.20x = 122,115.30 × 66,635.80
  4. Step 4: Simplify right side
    81,410.20x = 8,137,250,707.74
  5. Step 5: Solve for x
    x = 8,137,250,707.74/81,410.20
  6. Step 6: Final answer
    x = 99,953.70

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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.