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Finding the Fourth Proportional to 81,287.80, 122,190.90 and 76,622.20

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Solution

The fourth proportional to 81,287.80, 122,190.90 and 76,622.20 is: 115,177.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,287.80 : 122,190.90 = 76,622.20 : x
  2. Step 2: Convert to fraction form
    81,287.80/122,190.90 = 76,622.20/x
  3. Step 3: Cross multiply
    81,287.80x = 122,190.90 × 76,622.20
  4. Step 4: Simplify right side
    81,287.80x = 9,362,535,577.98
  5. Step 5: Solve for x
    x = 9,362,535,577.98/81,287.80
  6. Step 6: Final answer
    x = 115,177.62

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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.