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Finding the Fourth Proportional to 321.38, 443.46 and 188.58

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Solution

The fourth proportional to 321.38, 443.46 and 188.58 is: 260.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.38 : 443.46 = 188.58 : x
  2. Step 2: Convert to fraction form
    321.38/443.46 = 188.58/x
  3. Step 3: Cross multiply
    321.38x = 443.46 × 188.58
  4. Step 4: Simplify right side
    321.38x = 83,627.69
  5. Step 5: Solve for x
    x = 83,627.69/321.38
  6. Step 6: Final answer
    x = 260.21

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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.