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Finding the Fourth Proportional to 1,091.36, 1,636.96 and 398

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Solution

The fourth proportional to 1,091.36, 1,636.96 and 398 is: 596.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.36 : 1,636.96 = 398 : x
  2. Step 2: Convert to fraction form
    1,091.36/1,636.96 = 398/x
  3. Step 3: Cross multiply
    1,091.36x = 1,636.96 × 398
  4. Step 4: Simplify right side
    1,091.36x = 651,510.08
  5. Step 5: Solve for x
    x = 651,510.08/1,091.36
  6. Step 6: Final answer
    x = 596.97

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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.