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Finding the Fourth Proportional to 354.49, 489.21 and 197.12

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Solution

The fourth proportional to 354.49, 489.21 and 197.12 is: 272.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.49 : 489.21 = 197.12 : x
  2. Step 2: Convert to fraction form
    354.49/489.21 = 197.12/x
  3. Step 3: Cross multiply
    354.49x = 489.21 × 197.12
  4. Step 4: Simplify right side
    354.49x = 96,430.81
  5. Step 5: Solve for x
    x = 96,430.81/354.49
  6. Step 6: Final answer
    x = 272.02

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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.