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Finding the Fourth Proportional to 645.48, 890.56 and 365.69

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Solution

The fourth proportional to 645.48, 890.56 and 365.69 is: 504.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.48 : 890.56 = 365.69 : x
  2. Step 2: Convert to fraction form
    645.48/890.56 = 365.69/x
  3. Step 3: Cross multiply
    645.48x = 890.56 × 365.69
  4. Step 4: Simplify right side
    645.48x = 325,671.57
  5. Step 5: Solve for x
    x = 325,671.57/645.48
  6. Step 6: Final answer
    x = 504.54

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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.