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Finding the Fourth Proportional to 354, 488.52 and 198.75

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Solution

The fourth proportional to 354, 488.52 and 198.75 is: 274.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    354 : 488.52 = 198.75 : x
  2. Step 2: Convert to fraction form
    354/488.52 = 198.75/x
  3. Step 3: Cross multiply
    354x = 488.52 × 198.75
  4. Step 4: Simplify right side
    354x = 97,093.35
  5. Step 5: Solve for x
    x = 97,093.35/354
  6. Step 6: Final answer
    x = 274.28

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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.