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Finding the Fourth Proportional to 1,040.82, 1,436.47 and 668.22

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Solution

The fourth proportional to 1,040.82, 1,436.47 and 668.22 is: 922.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.82 : 1,436.47 = 668.22 : x
  2. Step 2: Convert to fraction form
    1,040.82/1,436.47 = 668.22/x
  3. Step 3: Cross multiply
    1,040.82x = 1,436.47 × 668.22
  4. Step 4: Simplify right side
    1,040.82x = 959,877.98
  5. Step 5: Solve for x
    x = 959,877.98/1,040.82
  6. Step 6: Final answer
    x = 922.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.