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Finding the Fourth Proportional to 843.40, 1,262.69 and 670.31

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Solution

The fourth proportional to 843.40, 1,262.69 and 670.31 is: 1,003.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.40 : 1,262.69 = 670.31 : x
  2. Step 2: Convert to fraction form
    843.40/1,262.69 = 670.31/x
  3. Step 3: Cross multiply
    843.40x = 1,262.69 × 670.31
  4. Step 4: Simplify right side
    843.40x = 846,393.73
  5. Step 5: Solve for x
    x = 846,393.73/843.40
  6. Step 6: Final answer
    x = 1,003.55

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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.