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Finding the Fourth Proportional to 375.75, 518.60 and 218.40

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Solution

The fourth proportional to 375.75, 518.60 and 218.40 is: 301.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.75 : 518.60 = 218.40 : x
  2. Step 2: Convert to fraction form
    375.75/518.60 = 218.40/x
  3. Step 3: Cross multiply
    375.75x = 518.60 × 218.40
  4. Step 4: Simplify right side
    375.75x = 113,262.24
  5. Step 5: Solve for x
    x = 113,262.24/375.75
  6. Step 6: Final answer
    x = 301.43

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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.