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Finding the Fourth Proportional to 355.05, 489.65 and 223.83

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Solution

The fourth proportional to 355.05, 489.65 and 223.83 is: 308.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.05 : 489.65 = 223.83 : x
  2. Step 2: Convert to fraction form
    355.05/489.65 = 223.83/x
  3. Step 3: Cross multiply
    355.05x = 489.65 × 223.83
  4. Step 4: Simplify right side
    355.05x = 109,597.24
  5. Step 5: Solve for x
    x = 109,597.24/355.05
  6. Step 6: Final answer
    x = 308.68

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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.