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Finding the Fourth Proportional to 243.75, 336.21 and 145.55

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Solution

The fourth proportional to 243.75, 336.21 and 145.55 is: 200.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.75 : 336.21 = 145.55 : x
  2. Step 2: Convert to fraction form
    243.75/336.21 = 145.55/x
  3. Step 3: Cross multiply
    243.75x = 336.21 × 145.55
  4. Step 4: Simplify right side
    243.75x = 48,933.68
  5. Step 5: Solve for x
    x = 48,933.68/243.75
  6. Step 6: Final answer
    x = 200.75

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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.