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Finding the Fourth Proportional to 481.68, 721.56 and 420.60

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Solution

The fourth proportional to 481.68, 721.56 and 420.60 is: 630.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.68 : 721.56 = 420.60 : x
  2. Step 2: Convert to fraction form
    481.68/721.56 = 420.60/x
  3. Step 3: Cross multiply
    481.68x = 721.56 × 420.60
  4. Step 4: Simplify right side
    481.68x = 303,488.14
  5. Step 5: Solve for x
    x = 303,488.14/481.68
  6. Step 6: Final answer
    x = 630.06

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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.