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Finding the Fourth Proportional to 243.13, 364.78 and 145.69

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Solution

The fourth proportional to 243.13, 364.78 and 145.69 is: 218.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.13 : 364.78 = 145.69 : x
  2. Step 2: Convert to fraction form
    243.13/364.78 = 145.69/x
  3. Step 3: Cross multiply
    243.13x = 364.78 × 145.69
  4. Step 4: Simplify right side
    243.13x = 53,142.97
  5. Step 5: Solve for x
    x = 53,142.97/243.13
  6. Step 6: Final answer
    x = 218.58

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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.