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Finding the Fourth Proportional to 665.94, 999.31 and 281.19

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Solution

The fourth proportional to 665.94, 999.31 and 281.19 is: 421.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.94 : 999.31 = 281.19 : x
  2. Step 2: Convert to fraction form
    665.94/999.31 = 281.19/x
  3. Step 3: Cross multiply
    665.94x = 999.31 × 281.19
  4. Step 4: Simplify right side
    665.94x = 280,995.98
  5. Step 5: Solve for x
    x = 280,995.98/665.94
  6. Step 6: Final answer
    x = 421.95

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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.