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Finding the Fourth Proportional to 481.40, 721.90 and 156.68

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Solution

The fourth proportional to 481.40, 721.90 and 156.68 is: 234.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.40 : 721.90 = 156.68 : x
  2. Step 2: Convert to fraction form
    481.40/721.90 = 156.68/x
  3. Step 3: Cross multiply
    481.40x = 721.90 × 156.68
  4. Step 4: Simplify right side
    481.40x = 113,107.29
  5. Step 5: Solve for x
    x = 113,107.29/481.40
  6. Step 6: Final answer
    x = 234.95

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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.