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Finding the Fourth Proportional to 1,092.26, 1,638.72 and 399.26

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Solution

The fourth proportional to 1,092.26, 1,638.72 and 399.26 is: 599.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,092.26 : 1,638.72 = 399.26 : x
  2. Step 2: Convert to fraction form
    1,092.26/1,638.72 = 399.26/x
  3. Step 3: Cross multiply
    1,092.26x = 1,638.72 × 399.26
  4. Step 4: Simplify right side
    1,092.26x = 654,275.35
  5. Step 5: Solve for x
    x = 654,275.35/1,092.26
  6. Step 6: Final answer
    x = 599.01

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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.