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Finding the Fourth Proportional to 321.07, 481.30 and 156.43

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Solution

The fourth proportional to 321.07, 481.30 and 156.43 is: 234.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.07 : 481.30 = 156.43 : x
  2. Step 2: Convert to fraction form
    321.07/481.30 = 156.43/x
  3. Step 3: Cross multiply
    321.07x = 481.30 × 156.43
  4. Step 4: Simplify right side
    321.07x = 75,288.98
  5. Step 5: Solve for x
    x = 75,288.98/321.07
  6. Step 6: Final answer
    x = 234.50

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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.