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Finding the Fourth Proportional to 1,091.13, 1,636.70 and 269.42

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Solution

The fourth proportional to 1,091.13, 1,636.70 and 269.42 is: 404.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.13 : 1,636.70 = 269.42 : x
  2. Step 2: Convert to fraction form
    1,091.13/1,636.70 = 269.42/x
  3. Step 3: Cross multiply
    1,091.13x = 1,636.70 × 269.42
  4. Step 4: Simplify right side
    1,091.13x = 440,959.71
  5. Step 5: Solve for x
    x = 440,959.71/1,091.13
  6. Step 6: Final answer
    x = 404.13

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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.