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Finding the Fourth Proportional to 490.35, 735.51 and 189.79

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Solution

The fourth proportional to 490.35, 735.51 and 189.79 is: 284.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.35 : 735.51 = 189.79 : x
  2. Step 2: Convert to fraction form
    490.35/735.51 = 189.79/x
  3. Step 3: Cross multiply
    490.35x = 735.51 × 189.79
  4. Step 4: Simplify right side
    490.35x = 139,593.85
  5. Step 5: Solve for x
    x = 139,593.85/490.35
  6. Step 6: Final answer
    x = 284.68

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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.