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Finding the Fourth Proportional to 81,622.40, 122,433.60 and 80,844.80

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Solution

The fourth proportional to 81,622.40, 122,433.60 and 80,844.80 is: 121,267.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,622.40 : 122,433.60 = 80,844.80 : x
  2. Step 2: Convert to fraction form
    81,622.40/122,433.60 = 80,844.80/x
  3. Step 3: Cross multiply
    81,622.40x = 122,433.60 × 80,844.80
  4. Step 4: Simplify right side
    81,622.40x = 9,898,119,905.28
  5. Step 5: Solve for x
    x = 9,898,119,905.28/81,622.40
  6. Step 6: Final answer
    x = 121,267.20

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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.