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Finding the Fourth Proportional to 427.61, 640.93 and 211.34

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Solution

The fourth proportional to 427.61, 640.93 and 211.34 is: 316.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.61 : 640.93 = 211.34 : x
  2. Step 2: Convert to fraction form
    427.61/640.93 = 211.34/x
  3. Step 3: Cross multiply
    427.61x = 640.93 × 211.34
  4. Step 4: Simplify right side
    427.61x = 135,454.15
  5. Step 5: Solve for x
    x = 135,454.15/427.61
  6. Step 6: Final answer
    x = 316.77

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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.