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Finding the Fourth Proportional to 321.87, 482.81 and 105.45

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Solution

The fourth proportional to 321.87, 482.81 and 105.45 is: 158.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.87 : 482.81 = 105.45 : x
  2. Step 2: Convert to fraction form
    321.87/482.81 = 105.45/x
  3. Step 3: Cross multiply
    321.87x = 482.81 × 105.45
  4. Step 4: Simplify right side
    321.87x = 50,912.31
  5. Step 5: Solve for x
    x = 50,912.31/321.87
  6. Step 6: Final answer
    x = 158.18

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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.