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Finding the Fourth Proportional to 321.90, 444.01 and 190.81

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Solution

The fourth proportional to 321.90, 444.01 and 190.81 is: 263.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.90 : 444.01 = 190.81 : x
  2. Step 2: Convert to fraction form
    321.90/444.01 = 190.81/x
  3. Step 3: Cross multiply
    321.90x = 444.01 × 190.81
  4. Step 4: Simplify right side
    321.90x = 84,721.55
  5. Step 5: Solve for x
    x = 84,721.55/321.90
  6. Step 6: Final answer
    x = 263.19

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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.