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Finding the Fourth Proportional to 1,091.15, 1,636.48 and 311.14

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Solution

The fourth proportional to 1,091.15, 1,636.48 and 311.14 is: 466.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.15 : 1,636.48 = 311.14 : x
  2. Step 2: Convert to fraction form
    1,091.15/1,636.48 = 311.14/x
  3. Step 3: Cross multiply
    1,091.15x = 1,636.48 × 311.14
  4. Step 4: Simplify right side
    1,091.15x = 509,164.65
  5. Step 5: Solve for x
    x = 509,164.65/1,091.15
  6. Step 6: Final answer
    x = 466.63

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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.