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Finding the Fourth Proportional to 492.25, 679.31 and 285.37

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Solution

The fourth proportional to 492.25, 679.31 and 285.37 is: 393.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.25 : 679.31 = 285.37 : x
  2. Step 2: Convert to fraction form
    492.25/679.31 = 285.37/x
  3. Step 3: Cross multiply
    492.25x = 679.31 × 285.37
  4. Step 4: Simplify right side
    492.25x = 193,854.69
  5. Step 5: Solve for x
    x = 193,854.69/492.25
  6. Step 6: Final answer
    x = 393.81

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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.