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Finding the Fourth Proportional to 442.66, 664.15 and 214.50

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Solution

The fourth proportional to 442.66, 664.15 and 214.50 is: 321.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.66 : 664.15 = 214.50 : x
  2. Step 2: Convert to fraction form
    442.66/664.15 = 214.50/x
  3. Step 3: Cross multiply
    442.66x = 664.15 × 214.50
  4. Step 4: Simplify right side
    442.66x = 142,460.18
  5. Step 5: Solve for x
    x = 142,460.18/442.66
  6. Step 6: Final answer
    x = 321.83

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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.