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Finding the Fourth Proportional to 81,724.60, 122,586.90 and 81,206.20

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Solution

The fourth proportional to 81,724.60, 122,586.90 and 81,206.20 is: 121,809.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,724.60 : 122,586.90 = 81,206.20 : x
  2. Step 2: Convert to fraction form
    81,724.60/122,586.90 = 81,206.20/x
  3. Step 3: Cross multiply
    81,724.60x = 122,586.90 × 81,206.20
  4. Step 4: Simplify right side
    81,724.60x = 9,954,816,318.78
  5. Step 5: Solve for x
    x = 9,954,816,318.78/81,724.60
  6. Step 6: Final answer
    x = 121,809.30

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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.