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Finding the Fourth Proportional to 427.35, 641 and 119.22

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Solution

The fourth proportional to 427.35, 641 and 119.22 is: 178.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.35 : 641 = 119.22 : x
  2. Step 2: Convert to fraction form
    427.35/641 = 119.22/x
  3. Step 3: Cross multiply
    427.35x = 641 × 119.22
  4. Step 4: Simplify right side
    427.35x = 76,416.82
  5. Step 5: Solve for x
    x = 76,416.82/427.35
  6. Step 6: Final answer
    x = 178.82

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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.