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Finding the Fourth Proportional to 81,994.60, 122,991.90 and 74,121.40

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Solution

The fourth proportional to 81,994.60, 122,991.90 and 74,121.40 is: 111,182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,994.60 : 122,991.90 = 74,121.40 : x
  2. Step 2: Convert to fraction form
    81,994.60/122,991.90 = 74,121.40/x
  3. Step 3: Cross multiply
    81,994.60x = 122,991.90 × 74,121.40
  4. Step 4: Simplify right side
    81,994.60x = 9,116,331,816.66
  5. Step 5: Solve for x
    x = 9,116,331,816.66/81,994.60
  6. Step 6: Final answer
    x = 111,182.10

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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.