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Finding the Fourth Proportional to 243.89, 336.39 and 145.64

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Solution

The fourth proportional to 243.89, 336.39 and 145.64 is: 200.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.89 : 336.39 = 145.64 : x
  2. Step 2: Convert to fraction form
    243.89/336.39 = 145.64/x
  3. Step 3: Cross multiply
    243.89x = 336.39 × 145.64
  4. Step 4: Simplify right side
    243.89x = 48,991.84
  5. Step 5: Solve for x
    x = 48,991.84/243.89
  6. Step 6: Final answer
    x = 200.88

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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.