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Finding the Fourth Proportional to 354.99, 489.78 and 230.79

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Solution

The fourth proportional to 354.99, 489.78 and 230.79 is: 318.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.99 : 489.78 = 230.79 : x
  2. Step 2: Convert to fraction form
    354.99/489.78 = 230.79/x
  3. Step 3: Cross multiply
    354.99x = 489.78 × 230.79
  4. Step 4: Simplify right side
    354.99x = 113,036.33
  5. Step 5: Solve for x
    x = 113,036.33/354.99
  6. Step 6: Final answer
    x = 318.42

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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.