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Finding the Fourth Proportional to 427.74, 640.44 and 297.60

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Solution

The fourth proportional to 427.74, 640.44 and 297.60 is: 445.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.74 : 640.44 = 297.60 : x
  2. Step 2: Convert to fraction form
    427.74/640.44 = 297.60/x
  3. Step 3: Cross multiply
    427.74x = 640.44 × 297.60
  4. Step 4: Simplify right side
    427.74x = 190,594.94
  5. Step 5: Solve for x
    x = 190,594.94/427.74
  6. Step 6: Final answer
    x = 445.59

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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.