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Finding the Fourth Proportional to 354.86, 489.88 and 223.94

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Solution

The fourth proportional to 354.86, 489.88 and 223.94 is: 309.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.86 : 489.88 = 223.94 : x
  2. Step 2: Convert to fraction form
    354.86/489.88 = 223.94/x
  3. Step 3: Cross multiply
    354.86x = 489.88 × 223.94
  4. Step 4: Simplify right side
    354.86x = 109,703.73
  5. Step 5: Solve for x
    x = 109,703.73/354.86
  6. Step 6: Final answer
    x = 309.15

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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.