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Finding the Fourth Proportional to 110,612.80, 165,721.20 and 67,256.80

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Solution

The fourth proportional to 110,612.80, 165,721.20 and 67,256.80 is: 100,764.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    110,612.80 : 165,721.20 = 67,256.80 : x
  2. Step 2: Convert to fraction form
    110,612.80/165,721.20 = 67,256.80/x
  3. Step 3: Cross multiply
    110,612.80x = 165,721.20 × 67,256.80
  4. Step 4: Simplify right side
    110,612.80x = 11,145,877,604.16
  5. Step 5: Solve for x
    x = 11,145,877,604.16/110,612.80
  6. Step 6: Final answer
    x = 100,764.81

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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.