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Finding the Fourth Proportional to 1,728.21, 2,591.91 and 495.39

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Solution

The fourth proportional to 1,728.21, 2,591.91 and 495.39 is: 742.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.21 : 2,591.91 = 495.39 : x
  2. Step 2: Convert to fraction form
    1,728.21/2,591.91 = 495.39/x
  3. Step 3: Cross multiply
    1,728.21x = 2,591.91 × 495.39
  4. Step 4: Simplify right side
    1,728.21x = 1,284,006.29
  5. Step 5: Solve for x
    x = 1,284,006.29/1,728.21
  6. Step 6: Final answer
    x = 742.97

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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.