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Finding the Fourth Proportional to 29,172.80, 43,759.20 and 8,112.80

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Solution

The fourth proportional to 29,172.80, 43,759.20 and 8,112.80 is: 12,169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,172.80 : 43,759.20 = 8,112.80 : x
  2. Step 2: Convert to fraction form
    29,172.80/43,759.20 = 8,112.80/x
  3. Step 3: Cross multiply
    29,172.80x = 43,759.20 × 8,112.80
  4. Step 4: Simplify right side
    29,172.80x = 355,009,637.76
  5. Step 5: Solve for x
    x = 355,009,637.76/29,172.80
  6. Step 6: Final answer
    x = 12,169.20

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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.