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Finding the Fourth Proportional to 909.92, 1,361.90 and 666.38

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Solution

The fourth proportional to 909.92, 1,361.90 and 666.38 is: 997.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.92 : 1,361.90 = 666.38 : x
  2. Step 2: Convert to fraction form
    909.92/1,361.90 = 666.38/x
  3. Step 3: Cross multiply
    909.92x = 1,361.90 × 666.38
  4. Step 4: Simplify right side
    909.92x = 907,542.92
  5. Step 5: Solve for x
    x = 907,542.92/909.92
  6. Step 6: Final answer
    x = 997.39

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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.