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Finding the Fourth Proportional to 644.73, 888.77 and 395.86

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Solution

The fourth proportional to 644.73, 888.77 and 395.86 is: 545.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.73 : 888.77 = 395.86 : x
  2. Step 2: Convert to fraction form
    644.73/888.77 = 395.86/x
  3. Step 3: Cross multiply
    644.73x = 888.77 × 395.86
  4. Step 4: Simplify right side
    644.73x = 351,831.43
  5. Step 5: Solve for x
    x = 351,831.43/644.73
  6. Step 6: Final answer
    x = 545.70

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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.