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Finding the Fourth Proportional to 81,664.40, 122,399.40 and 34,279.40

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Solution

The fourth proportional to 81,664.40, 122,399.40 and 34,279.40 is: 51,378.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,664.40 : 122,399.40 = 34,279.40 : x
  2. Step 2: Convert to fraction form
    81,664.40/122,399.40 = 34,279.40/x
  3. Step 3: Cross multiply
    81,664.40x = 122,399.40 × 34,279.40
  4. Step 4: Simplify right side
    81,664.40x = 4,195,777,992.36
  5. Step 5: Solve for x
    x = 4,195,777,992.36/81,664.40
  6. Step 6: Final answer
    x = 51,378.30

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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.