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Finding the Fourth Proportional to 321.35, 481.89 and 156.71

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Solution

The fourth proportional to 321.35, 481.89 and 156.71 is: 235.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.35 : 481.89 = 156.71 : x
  2. Step 2: Convert to fraction form
    321.35/481.89 = 156.71/x
  3. Step 3: Cross multiply
    321.35x = 481.89 × 156.71
  4. Step 4: Simplify right side
    321.35x = 75,518.77
  5. Step 5: Solve for x
    x = 75,518.77/321.35
  6. Step 6: Final answer
    x = 235.01

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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.