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Finding the Fourth Proportional to 774, 1,067.74 and 553.09

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Solution

The fourth proportional to 774, 1,067.74 and 553.09 is: 762.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    774 : 1,067.74 = 553.09 : x
  2. Step 2: Convert to fraction form
    774/1,067.74 = 553.09/x
  3. Step 3: Cross multiply
    774x = 1,067.74 × 553.09
  4. Step 4: Simplify right side
    774x = 590,556.32
  5. Step 5: Solve for x
    x = 590,556.32/774
  6. Step 6: Final answer
    x = 762.99

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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.