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Finding the Fourth Proportional to 81,286.80, 122,189.40 and 76,621.20

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Solution

The fourth proportional to 81,286.80, 122,189.40 and 76,621.20 is: 115,176.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,286.80 : 122,189.40 = 76,621.20 : x
  2. Step 2: Convert to fraction form
    81,286.80/122,189.40 = 76,621.20/x
  3. Step 3: Cross multiply
    81,286.80x = 122,189.40 × 76,621.20
  4. Step 4: Simplify right side
    81,286.80x = 9,362,298,455.28
  5. Step 5: Solve for x
    x = 9,362,298,455.28/81,286.80
  6. Step 6: Final answer
    x = 115,176.12

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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.