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Finding the Fourth Proportional to 427.48, 641.45 and 211.07

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Solution

The fourth proportional to 427.48, 641.45 and 211.07 is: 316.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.48 : 641.45 = 211.07 : x
  2. Step 2: Convert to fraction form
    427.48/641.45 = 211.07/x
  3. Step 3: Cross multiply
    427.48x = 641.45 × 211.07
  4. Step 4: Simplify right side
    427.48x = 135,390.85
  5. Step 5: Solve for x
    x = 135,390.85/427.48
  6. Step 6: Final answer
    x = 316.72

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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.