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Finding the Fourth Proportional to 428.22, 641.84 and 298.26

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Solution

The fourth proportional to 428.22, 641.84 and 298.26 is: 447.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.22 : 641.84 = 298.26 : x
  2. Step 2: Convert to fraction form
    428.22/641.84 = 298.26/x
  3. Step 3: Cross multiply
    428.22x = 641.84 × 298.26
  4. Step 4: Simplify right side
    428.22x = 191,433.71
  5. Step 5: Solve for x
    x = 191,433.71/428.22
  6. Step 6: Final answer
    x = 447.05

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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.