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Finding the Fourth Proportional to 427.44, 640.90 and 193.08

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Solution

The fourth proportional to 427.44, 640.90 and 193.08 is: 289.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.44 : 640.90 = 193.08 : x
  2. Step 2: Convert to fraction form
    427.44/640.90 = 193.08/x
  3. Step 3: Cross multiply
    427.44x = 640.90 × 193.08
  4. Step 4: Simplify right side
    427.44x = 123,744.97
  5. Step 5: Solve for x
    x = 123,744.97/427.44
  6. Step 6: Final answer
    x = 289.50

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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.