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Finding the Fourth Proportional to 489, 733.48 and 123.79

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Solution

The fourth proportional to 489, 733.48 and 123.79 is: 185.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 733.48 = 123.79 : x
  2. Step 2: Convert to fraction form
    489/733.48 = 123.79/x
  3. Step 3: Cross multiply
    489x = 733.48 × 123.79
  4. Step 4: Simplify right side
    489x = 90,797.49
  5. Step 5: Solve for x
    x = 90,797.49/489
  6. Step 6: Final answer
    x = 185.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.