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Finding the Fourth Proportional to 354.20, 488.88 and 243.64

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Solution

The fourth proportional to 354.20, 488.88 and 243.64 is: 336.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.20 : 488.88 = 243.64 : x
  2. Step 2: Convert to fraction form
    354.20/488.88 = 243.64/x
  3. Step 3: Cross multiply
    354.20x = 488.88 × 243.64
  4. Step 4: Simplify right side
    354.20x = 119,110.72
  5. Step 5: Solve for x
    x = 119,110.72/354.20
  6. Step 6: Final answer
    x = 336.28

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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.