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Finding the Fourth Proportional to 1,136.78, 1,705.42 and 443.49

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Solution

The fourth proportional to 1,136.78, 1,705.42 and 443.49 is: 665.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.78 : 1,705.42 = 443.49 : x
  2. Step 2: Convert to fraction form
    1,136.78/1,705.42 = 443.49/x
  3. Step 3: Cross multiply
    1,136.78x = 1,705.42 × 443.49
  4. Step 4: Simplify right side
    1,136.78x = 756,330.87
  5. Step 5: Solve for x
    x = 756,330.87/1,136.78
  6. Step 6: Final answer
    x = 665.33

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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.