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Finding the Fourth Proportional to 2,138.80, 3,209.76 and 1,409.92

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Solution

The fourth proportional to 2,138.80, 3,209.76 and 1,409.92 is: 2,115.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.80 : 3,209.76 = 1,409.92 : x
  2. Step 2: Convert to fraction form
    2,138.80/3,209.76 = 1,409.92/x
  3. Step 3: Cross multiply
    2,138.80x = 3,209.76 × 1,409.92
  4. Step 4: Simplify right side
    2,138.80x = 4,525,504.82
  5. Step 5: Solve for x
    x = 4,525,504.82/2,138.80
  6. Step 6: Final answer
    x = 2,115.91

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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.