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Finding the Fourth Proportional to 427.82, 642.13 and 211.41

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Solution

The fourth proportional to 427.82, 642.13 and 211.41 is: 317.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.82 : 642.13 = 211.41 : x
  2. Step 2: Convert to fraction form
    427.82/642.13 = 211.41/x
  3. Step 3: Cross multiply
    427.82x = 642.13 × 211.41
  4. Step 4: Simplify right side
    427.82x = 135,752.17
  5. Step 5: Solve for x
    x = 135,752.17/427.82
  6. Step 6: Final answer
    x = 317.32

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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.