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Finding the Fourth Proportional to 427.90, 641.40 and 211.36

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Solution

The fourth proportional to 427.90, 641.40 and 211.36 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.90 : 641.40 = 211.36 : x
  2. Step 2: Convert to fraction form
    427.90/641.40 = 211.36/x
  3. Step 3: Cross multiply
    427.90x = 641.40 × 211.36
  4. Step 4: Simplify right side
    427.90x = 135,566.30
  5. Step 5: Solve for x
    x = 135,566.30/427.90
  6. Step 6: Final answer
    x = 316.82

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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.