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Finding the Fourth Proportional to 644.57, 888.62 and 408.40

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Solution

The fourth proportional to 644.57, 888.62 and 408.40 is: 563.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.57 : 888.62 = 408.40 : x
  2. Step 2: Convert to fraction form
    644.57/888.62 = 408.40/x
  3. Step 3: Cross multiply
    644.57x = 888.62 × 408.40
  4. Step 4: Simplify right side
    644.57x = 362,912.41
  5. Step 5: Solve for x
    x = 362,912.41/644.57
  6. Step 6: Final answer
    x = 563.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.