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Finding the Fourth Proportional to 481.12, 721.60 and 156.72

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Solution

The fourth proportional to 481.12, 721.60 and 156.72 is: 235.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.12 : 721.60 = 156.72 : x
  2. Step 2: Convert to fraction form
    481.12/721.60 = 156.72/x
  3. Step 3: Cross multiply
    481.12x = 721.60 × 156.72
  4. Step 4: Simplify right side
    481.12x = 113,089.15
  5. Step 5: Solve for x
    x = 113,089.15/481.12
  6. Step 6: Final answer
    x = 235.05

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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.