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Finding the Fourth Proportional to 453.78, 626.27 and 321.21

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Solution

The fourth proportional to 453.78, 626.27 and 321.21 is: 443.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.78 : 626.27 = 321.21 : x
  2. Step 2: Convert to fraction form
    453.78/626.27 = 321.21/x
  3. Step 3: Cross multiply
    453.78x = 626.27 × 321.21
  4. Step 4: Simplify right side
    453.78x = 201,162.58
  5. Step 5: Solve for x
    x = 201,162.58/453.78
  6. Step 6: Final answer
    x = 443.30

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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.