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Finding the Fourth Proportional to 453.12, 624.69 and 321.90

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Solution

The fourth proportional to 453.12, 624.69 and 321.90 is: 443.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.12 : 624.69 = 321.90 : x
  2. Step 2: Convert to fraction form
    453.12/624.69 = 321.90/x
  3. Step 3: Cross multiply
    453.12x = 624.69 × 321.90
  4. Step 4: Simplify right side
    453.12x = 201,087.71
  5. Step 5: Solve for x
    x = 201,087.71/453.12
  6. Step 6: Final answer
    x = 443.78

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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.