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Finding the Fourth Proportional to 354.81, 489.60 and 223.95

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Solution

The fourth proportional to 354.81, 489.60 and 223.95 is: 309.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.81 : 489.60 = 223.95 : x
  2. Step 2: Convert to fraction form
    354.81/489.60 = 223.95/x
  3. Step 3: Cross multiply
    354.81x = 489.60 × 223.95
  4. Step 4: Simplify right side
    354.81x = 109,645.92
  5. Step 5: Solve for x
    x = 109,645.92/354.81
  6. Step 6: Final answer
    x = 309.03

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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.