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Finding the Fourth Proportional to 354.28, 488.16 and 243.64

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Solution

The fourth proportional to 354.28, 488.16 and 243.64 is: 335.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.28 : 488.16 = 243.64 : x
  2. Step 2: Convert to fraction form
    354.28/488.16 = 243.64/x
  3. Step 3: Cross multiply
    354.28x = 488.16 × 243.64
  4. Step 4: Simplify right side
    354.28x = 118,935.30
  5. Step 5: Solve for x
    x = 118,935.30/354.28
  6. Step 6: Final answer
    x = 335.71

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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.