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Finding the Fourth Proportional to 1,230.11, 1,697.73 and 811.09

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Solution

The fourth proportional to 1,230.11, 1,697.73 and 811.09 is: 1,119.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.11 : 1,697.73 = 811.09 : x
  2. Step 2: Convert to fraction form
    1,230.11/1,697.73 = 811.09/x
  3. Step 3: Cross multiply
    1,230.11x = 1,697.73 × 811.09
  4. Step 4: Simplify right side
    1,230.11x = 1,377,010.91
  5. Step 5: Solve for x
    x = 1,377,010.91/1,230.11
  6. Step 6: Final answer
    x = 1,119.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.