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Finding the Fourth Proportional to 892.70, 1,338.90 and 243.28

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Solution

The fourth proportional to 892.70, 1,338.90 and 243.28 is: 364.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.70 : 1,338.90 = 243.28 : x
  2. Step 2: Convert to fraction form
    892.70/1,338.90 = 243.28/x
  3. Step 3: Cross multiply
    892.70x = 1,338.90 × 243.28
  4. Step 4: Simplify right side
    892.70x = 325,728.35
  5. Step 5: Solve for x
    x = 325,728.35/892.70
  6. Step 6: Final answer
    x = 364.88

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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.