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Finding the Fourth Proportional to 908.21, 1,363.01 and 665.37

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Solution

The fourth proportional to 908.21, 1,363.01 and 665.37 is: 998.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.21 : 1,363.01 = 665.37 : x
  2. Step 2: Convert to fraction form
    908.21/1,363.01 = 665.37/x
  3. Step 3: Cross multiply
    908.21x = 1,363.01 × 665.37
  4. Step 4: Simplify right side
    908.21x = 906,905.96
  5. Step 5: Solve for x
    x = 906,905.96/908.21
  6. Step 6: Final answer
    x = 998.56

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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.