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Finding the Fourth Proportional to 2,172, 3,255.78 and 940.20

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Solution

The fourth proportional to 2,172, 3,255.78 and 940.20 is: 1,409.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172 : 3,255.78 = 940.20 : x
  2. Step 2: Convert to fraction form
    2,172/3,255.78 = 940.20/x
  3. Step 3: Cross multiply
    2,172x = 3,255.78 × 940.20
  4. Step 4: Simplify right side
    2,172x = 3,061,084.36
  5. Step 5: Solve for x
    x = 3,061,084.36/2,172
  6. Step 6: Final answer
    x = 1,409.34

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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.