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Finding the Fourth Proportional to 321.78, 482.67 and 105.39

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Solution

The fourth proportional to 321.78, 482.67 and 105.39 is: 158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.78 : 482.67 = 105.39 : x
  2. Step 2: Convert to fraction form
    321.78/482.67 = 105.39/x
  3. Step 3: Cross multiply
    321.78x = 482.67 × 105.39
  4. Step 4: Simplify right side
    321.78x = 50,868.59
  5. Step 5: Solve for x
    x = 50,868.59/321.78
  6. Step 6: Final answer
    x = 158.09

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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.