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Finding the Fourth Proportional to 628.35, 867.11 and 379.58

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Solution

The fourth proportional to 628.35, 867.11 and 379.58 is: 523.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.35 : 867.11 = 379.58 : x
  2. Step 2: Convert to fraction form
    628.35/867.11 = 379.58/x
  3. Step 3: Cross multiply
    628.35x = 867.11 × 379.58
  4. Step 4: Simplify right side
    628.35x = 329,139.31
  5. Step 5: Solve for x
    x = 329,139.31/628.35
  6. Step 6: Final answer
    x = 523.81

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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.