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Finding the Fourth Proportional to 218.45, 301.25 and 143.65

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Solution

The fourth proportional to 218.45, 301.25 and 143.65 is: 198.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.45 : 301.25 = 143.65 : x
  2. Step 2: Convert to fraction form
    218.45/301.25 = 143.65/x
  3. Step 3: Cross multiply
    218.45x = 301.25 × 143.65
  4. Step 4: Simplify right side
    218.45x = 43,273.09
  5. Step 5: Solve for x
    x = 43,273.09/218.45
  6. Step 6: Final answer
    x = 198.10

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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.