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Finding the Fourth Proportional to 1,372.28, 2,059.09 and 641.72

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Solution

The fourth proportional to 1,372.28, 2,059.09 and 641.72 is: 962.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.28 : 2,059.09 = 641.72 : x
  2. Step 2: Convert to fraction form
    1,372.28/2,059.09 = 641.72/x
  3. Step 3: Cross multiply
    1,372.28x = 2,059.09 × 641.72
  4. Step 4: Simplify right side
    1,372.28x = 1,321,362.78
  5. Step 5: Solve for x
    x = 1,321,362.78/1,372.28
  6. Step 6: Final answer
    x = 962.90

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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.