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Finding the Fourth Proportional to 109,809.20, 164,713.80 and 68,337.20

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Solution

The fourth proportional to 109,809.20, 164,713.80 and 68,337.20 is: 102,505.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,809.20 : 164,713.80 = 68,337.20 : x
  2. Step 2: Convert to fraction form
    109,809.20/164,713.80 = 68,337.20/x
  3. Step 3: Cross multiply
    109,809.20x = 164,713.80 × 68,337.20
  4. Step 4: Simplify right side
    109,809.20x = 11,256,079,893.36
  5. Step 5: Solve for x
    x = 11,256,079,893.36/109,809.20
  6. Step 6: Final answer
    x = 102,505.80

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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.