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Finding the Fourth Proportional to 628.36, 866.94 and 395.44

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Solution

The fourth proportional to 628.36, 866.94 and 395.44 is: 545.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.36 : 866.94 = 395.44 : x
  2. Step 2: Convert to fraction form
    628.36/866.94 = 395.44/x
  3. Step 3: Cross multiply
    628.36x = 866.94 × 395.44
  4. Step 4: Simplify right side
    628.36x = 342,822.75
  5. Step 5: Solve for x
    x = 342,822.75/628.36
  6. Step 6: Final answer
    x = 545.58

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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.