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Finding the Fourth Proportional to 492.09, 679.03 and 305.54

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Solution

The fourth proportional to 492.09, 679.03 and 305.54 is: 421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.09 : 679.03 = 305.54 : x
  2. Step 2: Convert to fraction form
    492.09/679.03 = 305.54/x
  3. Step 3: Cross multiply
    492.09x = 679.03 × 305.54
  4. Step 4: Simplify right side
    492.09x = 207,470.93
  5. Step 5: Solve for x
    x = 207,470.93/492.09
  6. Step 6: Final answer
    x = 421.61

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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.