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Finding the Fourth Proportional to 1,297.20, 1,789.71 and 773.16

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Solution

The fourth proportional to 1,297.20, 1,789.71 and 773.16 is: 1,066.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.20 : 1,789.71 = 773.16 : x
  2. Step 2: Convert to fraction form
    1,297.20/1,789.71 = 773.16/x
  3. Step 3: Cross multiply
    1,297.20x = 1,789.71 × 773.16
  4. Step 4: Simplify right side
    1,297.20x = 1,383,732.18
  5. Step 5: Solve for x
    x = 1,383,732.18/1,297.20
  6. Step 6: Final answer
    x = 1,066.71

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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.