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Finding the Fourth Proportional to 628.22, 941.31 and 319.65

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Solution

The fourth proportional to 628.22, 941.31 and 319.65 is: 478.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.22 : 941.31 = 319.65 : x
  2. Step 2: Convert to fraction form
    628.22/941.31 = 319.65/x
  3. Step 3: Cross multiply
    628.22x = 941.31 × 319.65
  4. Step 4: Simplify right side
    628.22x = 300,888.23
  5. Step 5: Solve for x
    x = 300,888.23/628.22
  6. Step 6: Final answer
    x = 478.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.