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Finding the Fourth Proportional to 81,994.40, 122,991.60 and 80,439.20

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Solution

The fourth proportional to 81,994.40, 122,991.60 and 80,439.20 is: 120,658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,994.40 : 122,991.60 = 80,439.20 : x
  2. Step 2: Convert to fraction form
    81,994.40/122,991.60 = 80,439.20/x
  3. Step 3: Cross multiply
    81,994.40x = 122,991.60 × 80,439.20
  4. Step 4: Simplify right side
    81,994.40x = 9,893,345,910.72
  5. Step 5: Solve for x
    x = 9,893,345,910.72/81,994.40
  6. Step 6: Final answer
    x = 120,658.80

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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.