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Finding the Fourth Proportional to 1,091.32, 1,636.96 and 321.82

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Solution

The fourth proportional to 1,091.32, 1,636.96 and 321.82 is: 482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.32 : 1,636.96 = 321.82 : x
  2. Step 2: Convert to fraction form
    1,091.32/1,636.96 = 321.82/x
  3. Step 3: Cross multiply
    1,091.32x = 1,636.96 × 321.82
  4. Step 4: Simplify right side
    1,091.32x = 526,806.47
  5. Step 5: Solve for x
    x = 526,806.47/1,091.32
  6. Step 6: Final answer
    x = 482.72

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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.