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Finding the Fourth Proportional to 1,231.94, 1,699.53 and 811.75

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Solution

The fourth proportional to 1,231.94, 1,699.53 and 811.75 is: 1,119.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.94 : 1,699.53 = 811.75 : x
  2. Step 2: Convert to fraction form
    1,231.94/1,699.53 = 811.75/x
  3. Step 3: Cross multiply
    1,231.94x = 1,699.53 × 811.75
  4. Step 4: Simplify right side
    1,231.94x = 1,379,593.48
  5. Step 5: Solve for x
    x = 1,379,593.48/1,231.94
  6. Step 6: Final answer
    x = 1,119.85

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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.