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Finding the Fourth Proportional to 830.67, 1,243.81 and 665.36

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Solution

The fourth proportional to 830.67, 1,243.81 and 665.36 is: 996.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.67 : 1,243.81 = 665.36 : x
  2. Step 2: Convert to fraction form
    830.67/1,243.81 = 665.36/x
  3. Step 3: Cross multiply
    830.67x = 1,243.81 × 665.36
  4. Step 4: Simplify right side
    830.67x = 827,583.95
  5. Step 5: Solve for x
    x = 827,583.95/830.67
  6. Step 6: Final answer
    x = 996.28

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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.