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Finding the Fourth Proportional to 321.28, 481.31 and 158.47

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Solution

The fourth proportional to 321.28, 481.31 and 158.47 is: 237.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.28 : 481.31 = 158.47 : x
  2. Step 2: Convert to fraction form
    321.28/481.31 = 158.47/x
  3. Step 3: Cross multiply
    321.28x = 481.31 × 158.47
  4. Step 4: Simplify right side
    321.28x = 76,271.79
  5. Step 5: Solve for x
    x = 76,271.79/321.28
  6. Step 6: Final answer
    x = 237.40

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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.