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Finding the Fourth Proportional to 641.26, 888.66 and 628.96

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Solution

The fourth proportional to 641.26, 888.66 and 628.96 is: 871.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.26 : 888.66 = 628.96 : x
  2. Step 2: Convert to fraction form
    641.26/888.66 = 628.96/x
  3. Step 3: Cross multiply
    641.26x = 888.66 × 628.96
  4. Step 4: Simplify right side
    641.26x = 558,928.19
  5. Step 5: Solve for x
    x = 558,928.19/641.26
  6. Step 6: Final answer
    x = 871.61

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.