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Finding the Fourth Proportional to 2,129.60, 3,201.60 and 1,812.80

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Solution

The fourth proportional to 2,129.60, 3,201.60 and 1,812.80 is: 2,725.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.60 : 3,201.60 = 1,812.80 : x
  2. Step 2: Convert to fraction form
    2,129.60/3,201.60 = 1,812.80/x
  3. Step 3: Cross multiply
    2,129.60x = 3,201.60 × 1,812.80
  4. Step 4: Simplify right side
    2,129.60x = 5,803,860.48
  5. Step 5: Solve for x
    x = 5,803,860.48/2,129.60
  6. Step 6: Final answer
    x = 2,725.33

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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.