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Finding the Fourth Proportional to 427.80, 640.30 and 324.52

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Solution

The fourth proportional to 427.80, 640.30 and 324.52 is: 485.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.80 : 640.30 = 324.52 : x
  2. Step 2: Convert to fraction form
    427.80/640.30 = 324.52/x
  3. Step 3: Cross multiply
    427.80x = 640.30 × 324.52
  4. Step 4: Simplify right side
    427.80x = 207,788.00
  5. Step 5: Solve for x
    x = 207,788.00/427.80
  6. Step 6: Final answer
    x = 485.71

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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.