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Finding the Fourth Proportional to 81,418.80, 122,225.40 and 45,908.40

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Solution

The fourth proportional to 81,418.80, 122,225.40 and 45,908.40 is: 68,917.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,418.80 : 122,225.40 = 45,908.40 : x
  2. Step 2: Convert to fraction form
    81,418.80/122,225.40 = 45,908.40/x
  3. Step 3: Cross multiply
    81,418.80x = 122,225.40 × 45,908.40
  4. Step 4: Simplify right side
    81,418.80x = 5,611,172,553.36
  5. Step 5: Solve for x
    x = 5,611,172,553.36/81,418.80
  6. Step 6: Final answer
    x = 68,917.41

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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.