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Finding the Fourth Proportional to 774.82, 1,069.14 and 494.95

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Solution

The fourth proportional to 774.82, 1,069.14 and 494.95 is: 682.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.82 : 1,069.14 = 494.95 : x
  2. Step 2: Convert to fraction form
    774.82/1,069.14 = 494.95/x
  3. Step 3: Cross multiply
    774.82x = 1,069.14 × 494.95
  4. Step 4: Simplify right side
    774.82x = 529,170.84
  5. Step 5: Solve for x
    x = 529,170.84/774.82
  6. Step 6: Final answer
    x = 682.96

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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.