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Finding the Fourth Proportional to 481.92, 664.48 and 307.20

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Solution

The fourth proportional to 481.92, 664.48 and 307.20 is: 423.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.92 : 664.48 = 307.20 : x
  2. Step 2: Convert to fraction form
    481.92/664.48 = 307.20/x
  3. Step 3: Cross multiply
    481.92x = 664.48 × 307.20
  4. Step 4: Simplify right side
    481.92x = 204,128.26
  5. Step 5: Solve for x
    x = 204,128.26/481.92
  6. Step 6: Final answer
    x = 423.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.