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Finding the Fourth Proportional to 453.72, 680.72 and 320.80

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Solution

The fourth proportional to 453.72, 680.72 and 320.80 is: 481.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.72 : 680.72 = 320.80 : x
  2. Step 2: Convert to fraction form
    453.72/680.72 = 320.80/x
  3. Step 3: Cross multiply
    453.72x = 680.72 × 320.80
  4. Step 4: Simplify right side
    453.72x = 218,374.98
  5. Step 5: Solve for x
    x = 218,374.98/453.72
  6. Step 6: Final answer
    x = 481.30

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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.