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Finding the Fourth Proportional to 492.25, 679.31 and 285.29

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Solution

The fourth proportional to 492.25, 679.31 and 285.29 is: 393.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.25 : 679.31 = 285.29 : x
  2. Step 2: Convert to fraction form
    492.25/679.31 = 285.29/x
  3. Step 3: Cross multiply
    492.25x = 679.31 × 285.29
  4. Step 4: Simplify right side
    492.25x = 193,798.92
  5. Step 5: Solve for x
    x = 193,798.92/492.25
  6. Step 6: Final answer
    x = 393.70

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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.