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Finding the Fourth Proportional to 481.20, 721.36 and 156.40

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Solution

The fourth proportional to 481.20, 721.36 and 156.40 is: 234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.20 : 721.36 = 156.40 : x
  2. Step 2: Convert to fraction form
    481.20/721.36 = 156.40/x
  3. Step 3: Cross multiply
    481.20x = 721.36 × 156.40
  4. Step 4: Simplify right side
    481.20x = 112,820.70
  5. Step 5: Solve for x
    x = 112,820.70/481.20
  6. Step 6: Final answer
    x = 234.46

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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.