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Finding the Fourth Proportional to 442.81, 664.45 and 211.66

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Solution

The fourth proportional to 442.81, 664.45 and 211.66 is: 317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.81 : 664.45 = 211.66 : x
  2. Step 2: Convert to fraction form
    442.81/664.45 = 211.66/x
  3. Step 3: Cross multiply
    442.81x = 664.45 × 211.66
  4. Step 4: Simplify right side
    442.81x = 140,637.49
  5. Step 5: Solve for x
    x = 140,637.49/442.81
  6. Step 6: Final answer
    x = 317.60

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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.