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Finding the Fourth Proportional to 428.73, 644.24 and 375.15

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Solution

The fourth proportional to 428.73, 644.24 and 375.15 is: 563.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.73 : 644.24 = 375.15 : x
  2. Step 2: Convert to fraction form
    428.73/644.24 = 375.15/x
  3. Step 3: Cross multiply
    428.73x = 644.24 × 375.15
  4. Step 4: Simplify right side
    428.73x = 241,684.76
  5. Step 5: Solve for x
    x = 241,684.76/428.73
  6. Step 6: Final answer
    x = 563.72

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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.