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Finding the Fourth Proportional to 644.56, 888.96 and 489.04

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Solution

The fourth proportional to 644.56, 888.96 and 489.04 is: 674.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.56 : 888.96 = 489.04 : x
  2. Step 2: Convert to fraction form
    644.56/888.96 = 489.04/x
  3. Step 3: Cross multiply
    644.56x = 888.96 × 489.04
  4. Step 4: Simplify right side
    644.56x = 434,737.00
  5. Step 5: Solve for x
    x = 434,737.00/644.56
  6. Step 6: Final answer
    x = 674.47

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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.