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Finding the Fourth Proportional to 645.11, 889.29 and 396.24

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Solution

The fourth proportional to 645.11, 889.29 and 396.24 is: 546.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.11 : 889.29 = 396.24 : x
  2. Step 2: Convert to fraction form
    645.11/889.29 = 396.24/x
  3. Step 3: Cross multiply
    645.11x = 889.29 × 396.24
  4. Step 4: Simplify right side
    645.11x = 352,370.60
  5. Step 5: Solve for x
    x = 352,370.60/645.11
  6. Step 6: Final answer
    x = 546.22

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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.