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Finding the Fourth Proportional to 427.47, 641.21 and 236.31

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Solution

The fourth proportional to 427.47, 641.21 and 236.31 is: 354.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.47 : 641.21 = 236.31 : x
  2. Step 2: Convert to fraction form
    427.47/641.21 = 236.31/x
  3. Step 3: Cross multiply
    427.47x = 641.21 × 236.31
  4. Step 4: Simplify right side
    427.47x = 151,523.15
  5. Step 5: Solve for x
    x = 151,523.15/427.47
  6. Step 6: Final answer
    x = 354.47

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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.