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Finding the Fourth Proportional to 492.70, 739.30 and 218.76

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Solution

The fourth proportional to 492.70, 739.30 and 218.76 is: 328.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.70 : 739.30 = 218.76 : x
  2. Step 2: Convert to fraction form
    492.70/739.30 = 218.76/x
  3. Step 3: Cross multiply
    492.70x = 739.30 × 218.76
  4. Step 4: Simplify right side
    492.70x = 161,729.27
  5. Step 5: Solve for x
    x = 161,729.27/492.70
  6. Step 6: Final answer
    x = 328.25

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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.