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Finding the Fourth Proportional to 428.89, 644.15 and 246.64

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Solution

The fourth proportional to 428.89, 644.15 and 246.64 is: 370.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.89 : 644.15 = 246.64 : x
  2. Step 2: Convert to fraction form
    428.89/644.15 = 246.64/x
  3. Step 3: Cross multiply
    428.89x = 644.15 × 246.64
  4. Step 4: Simplify right side
    428.89x = 158,873.16
  5. Step 5: Solve for x
    x = 158,873.16/428.89
  6. Step 6: Final answer
    x = 370.43

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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.