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Finding the Fourth Proportional to 442.15, 663.24 and 211.07

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Solution

The fourth proportional to 442.15, 663.24 and 211.07 is: 316.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.15 : 663.24 = 211.07 : x
  2. Step 2: Convert to fraction form
    442.15/663.24 = 211.07/x
  3. Step 3: Cross multiply
    442.15x = 663.24 × 211.07
  4. Step 4: Simplify right side
    442.15x = 139,990.07
  5. Step 5: Solve for x
    x = 139,990.07/442.15
  6. Step 6: Final answer
    x = 316.61

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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.