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Finding the Fourth Proportional to 492, 679.26 and 317.65

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Solution

The fourth proportional to 492, 679.26 and 317.65 is: 438.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    492 : 679.26 = 317.65 : x
  2. Step 2: Convert to fraction form
    492/679.26 = 317.65/x
  3. Step 3: Cross multiply
    492x = 679.26 × 317.65
  4. Step 4: Simplify right side
    492x = 215,766.94
  5. Step 5: Solve for x
    x = 215,766.94/492
  6. Step 6: Final answer
    x = 438.55

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.