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Finding the Fourth Proportional to 645.54, 890.82 and 365.79

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Solution

The fourth proportional to 645.54, 890.82 and 365.79 is: 504.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.54 : 890.82 = 365.79 : x
  2. Step 2: Convert to fraction form
    645.54/890.82 = 365.79/x
  3. Step 3: Cross multiply
    645.54x = 890.82 × 365.79
  4. Step 4: Simplify right side
    645.54x = 325,853.05
  5. Step 5: Solve for x
    x = 325,853.05/645.54
  6. Step 6: Final answer
    x = 504.78

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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.