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Finding the Fourth Proportional to 1,091.21, 1,636.38 and 397.72

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Solution

The fourth proportional to 1,091.21, 1,636.38 and 397.72 is: 596.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.21 : 1,636.38 = 397.72 : x
  2. Step 2: Convert to fraction form
    1,091.21/1,636.38 = 397.72/x
  3. Step 3: Cross multiply
    1,091.21x = 1,636.38 × 397.72
  4. Step 4: Simplify right side
    1,091.21x = 650,816.96
  5. Step 5: Solve for x
    x = 650,816.96/1,091.21
  6. Step 6: Final answer
    x = 596.42

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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.