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Finding the Fourth Proportional to 420.82, 630.06 and 214.94

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Solution

The fourth proportional to 420.82, 630.06 and 214.94 is: 321.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.82 : 630.06 = 214.94 : x
  2. Step 2: Convert to fraction form
    420.82/630.06 = 214.94/x
  3. Step 3: Cross multiply
    420.82x = 630.06 × 214.94
  4. Step 4: Simplify right side
    420.82x = 135,427.07
  5. Step 5: Solve for x
    x = 135,427.07/420.82
  6. Step 6: Final answer
    x = 321.82

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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.