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Finding the Fourth Proportional to 774.15, 1,067.76 and 494.16

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Solution

The fourth proportional to 774.15, 1,067.76 and 494.16 is: 681.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.15 : 1,067.76 = 494.16 : x
  2. Step 2: Convert to fraction form
    774.15/1,067.76 = 494.16/x
  3. Step 3: Cross multiply
    774.15x = 1,067.76 × 494.16
  4. Step 4: Simplify right side
    774.15x = 527,644.28
  5. Step 5: Solve for x
    x = 527,644.28/774.15
  6. Step 6: Final answer
    x = 681.58

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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.