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Finding the Fourth Proportional to 628.69, 867.78 and 379.97

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Solution

The fourth proportional to 628.69, 867.78 and 379.97 is: 524.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.69 : 867.78 = 379.97 : x
  2. Step 2: Convert to fraction form
    628.69/867.78 = 379.97/x
  3. Step 3: Cross multiply
    628.69x = 867.78 × 379.97
  4. Step 4: Simplify right side
    628.69x = 329,730.37
  5. Step 5: Solve for x
    x = 329,730.37/628.69
  6. Step 6: Final answer
    x = 524.47

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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.