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Finding the Fourth Proportional to 297.45, 409.69 and 218.56

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Solution

The fourth proportional to 297.45, 409.69 and 218.56 is: 301.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.45 : 409.69 = 218.56 : x
  2. Step 2: Convert to fraction form
    297.45/409.69 = 218.56/x
  3. Step 3: Cross multiply
    297.45x = 409.69 × 218.56
  4. Step 4: Simplify right side
    297.45x = 89,541.85
  5. Step 5: Solve for x
    x = 89,541.85/297.45
  6. Step 6: Final answer
    x = 301.03

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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.