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Finding the Fourth Proportional to 644.15, 888.71 and 395.53

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Solution

The fourth proportional to 644.15, 888.71 and 395.53 is: 545.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.15 : 888.71 = 395.53 : x
  2. Step 2: Convert to fraction form
    644.15/888.71 = 395.53/x
  3. Step 3: Cross multiply
    644.15x = 888.71 × 395.53
  4. Step 4: Simplify right side
    644.15x = 351,505.05
  5. Step 5: Solve for x
    x = 351,505.05/644.15
  6. Step 6: Final answer
    x = 545.69

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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.