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Finding the Fourth Proportional to 1,215.37, 1,677.40 and 773.42

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Solution

The fourth proportional to 1,215.37, 1,677.40 and 773.42 is: 1,067.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.37 : 1,677.40 = 773.42 : x
  2. Step 2: Convert to fraction form
    1,215.37/1,677.40 = 773.42/x
  3. Step 3: Cross multiply
    1,215.37x = 1,677.40 × 773.42
  4. Step 4: Simplify right side
    1,215.37x = 1,297,324.39
  5. Step 5: Solve for x
    x = 1,297,324.39/1,215.37
  6. Step 6: Final answer
    x = 1,067.43

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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.