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Finding the Fourth Proportional to 500.82, 691.12 and 279.78

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Solution

The fourth proportional to 500.82, 691.12 and 279.78 is: 386.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.82 : 691.12 = 279.78 : x
  2. Step 2: Convert to fraction form
    500.82/691.12 = 279.78/x
  3. Step 3: Cross multiply
    500.82x = 691.12 × 279.78
  4. Step 4: Simplify right side
    500.82x = 193,361.55
  5. Step 5: Solve for x
    x = 193,361.55/500.82
  6. Step 6: Final answer
    x = 386.09

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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.