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Finding the Fourth Proportional to 492.78, 739.49 and 218.86

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Solution

The fourth proportional to 492.78, 739.49 and 218.86 is: 328.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.78 : 739.49 = 218.86 : x
  2. Step 2: Convert to fraction form
    492.78/739.49 = 218.86/x
  3. Step 3: Cross multiply
    492.78x = 739.49 × 218.86
  4. Step 4: Simplify right side
    492.78x = 161,844.78
  5. Step 5: Solve for x
    x = 161,844.78/492.78
  6. Step 6: Final answer
    x = 328.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.