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Finding the Fourth Proportional to 644.25, 888.87 and 395.42

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Solution

The fourth proportional to 644.25, 888.87 and 395.42 is: 545.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.25 : 888.87 = 395.42 : x
  2. Step 2: Convert to fraction form
    644.25/888.87 = 395.42/x
  3. Step 3: Cross multiply
    644.25x = 888.87 × 395.42
  4. Step 4: Simplify right side
    644.25x = 351,474.01
  5. Step 5: Solve for x
    x = 351,474.01/644.25
  6. Step 6: Final answer
    x = 545.55

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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.