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Finding the Fourth Proportional to 128,820.80, 177,772.78 and 78,519.80

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Solution

The fourth proportional to 128,820.80, 177,772.78 and 78,519.80 is: 108,357.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,820.80 : 177,772.78 = 78,519.80 : x
  2. Step 2: Convert to fraction form
    128,820.80/177,772.78 = 78,519.80/x
  3. Step 3: Cross multiply
    128,820.80x = 177,772.78 × 78,519.80
  4. Step 4: Simplify right side
    128,820.80x = 13,958,683,131.04
  5. Step 5: Solve for x
    x = 13,958,683,131.04/128,820.80
  6. Step 6: Final answer
    x = 108,357.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.