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Finding the Fourth Proportional to 1,091.13, 1,636.70 and 321.63

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Solution

The fourth proportional to 1,091.13, 1,636.70 and 321.63 is: 482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.13 : 1,636.70 = 321.63 : x
  2. Step 2: Convert to fraction form
    1,091.13/1,636.70 = 321.63/x
  3. Step 3: Cross multiply
    1,091.13x = 1,636.70 × 321.63
  4. Step 4: Simplify right side
    1,091.13x = 526,410.21
  5. Step 5: Solve for x
    x = 526,410.21/1,091.13
  6. Step 6: Final answer
    x = 482.45

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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.