Home / 81,439.20-122,158.80-66,664.80

Finding the Fourth Proportional to 81,439.20, 122,158.80 and 66,664.80

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Solution

The fourth proportional to 81,439.20, 122,158.80 and 66,664.80 is: 99,997.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.20 : 122,158.80 = 66,664.80 : x
  2. Step 2: Convert to fraction form
    81,439.20/122,158.80 = 66,664.80/x
  3. Step 3: Cross multiply
    81,439.20x = 122,158.80 × 66,664.80
  4. Step 4: Simplify right side
    81,439.20x = 8,143,691,970.24
  5. Step 5: Solve for x
    x = 8,143,691,970.24/81,439.20
  6. Step 6: Final answer
    x = 99,997.20

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1.5x scale

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.