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Finding the Fourth Proportional to 218.97, 302.30 and 145.39

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Solution

The fourth proportional to 218.97, 302.30 and 145.39 is: 200.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.97 : 302.30 = 145.39 : x
  2. Step 2: Convert to fraction form
    218.97/302.30 = 145.39/x
  3. Step 3: Cross multiply
    218.97x = 302.30 × 145.39
  4. Step 4: Simplify right side
    218.97x = 43,949.89
  5. Step 5: Solve for x
    x = 43,949.89/218.97
  6. Step 6: Final answer
    x = 200.71

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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.