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Finding the Fourth Proportional to 428.22, 641.34 and 360.18

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Solution

The fourth proportional to 428.22, 641.34 and 360.18 is: 539.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.22 : 641.34 = 360.18 : x
  2. Step 2: Convert to fraction form
    428.22/641.34 = 360.18/x
  3. Step 3: Cross multiply
    428.22x = 641.34 × 360.18
  4. Step 4: Simplify right side
    428.22x = 230,997.84
  5. Step 5: Solve for x
    x = 230,997.84/428.22
  6. Step 6: Final answer
    x = 539.44

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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.