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Finding the Fourth Proportional to 644.06, 888.60 and 395.26

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Solution

The fourth proportional to 644.06, 888.60 and 395.26 is: 545.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.06 : 888.60 = 395.26 : x
  2. Step 2: Convert to fraction form
    644.06/888.60 = 395.26/x
  3. Step 3: Cross multiply
    644.06x = 888.60 × 395.26
  4. Step 4: Simplify right side
    644.06x = 351,225.81
  5. Step 5: Solve for x
    x = 351,225.81/644.06
  6. Step 6: Final answer
    x = 545.33

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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.