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Finding the Fourth Proportional to 243.28, 336.16 and 196.56

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Solution

The fourth proportional to 243.28, 336.16 and 196.56 is: 271.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.28 : 336.16 = 196.56 : x
  2. Step 2: Convert to fraction form
    243.28/336.16 = 196.56/x
  3. Step 3: Cross multiply
    243.28x = 336.16 × 196.56
  4. Step 4: Simplify right side
    243.28x = 66,075.61
  5. Step 5: Solve for x
    x = 66,075.61/243.28
  6. Step 6: Final answer
    x = 271.60

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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.