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Finding the Fourth Proportional to 354.46, 489.12 and 199.21

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Solution

The fourth proportional to 354.46, 489.12 and 199.21 is: 274.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.46 : 489.12 = 199.21 : x
  2. Step 2: Convert to fraction form
    354.46/489.12 = 199.21/x
  3. Step 3: Cross multiply
    354.46x = 489.12 × 199.21
  4. Step 4: Simplify right side
    354.46x = 97,437.60
  5. Step 5: Solve for x
    x = 97,437.60/354.46
  6. Step 6: Final answer
    x = 274.89

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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.