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Finding the Fourth Proportional to 1,016.78, 1,403.75 and 668.07

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Solution

The fourth proportional to 1,016.78, 1,403.75 and 668.07 is: 922.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.78 : 1,403.75 = 668.07 : x
  2. Step 2: Convert to fraction form
    1,016.78/1,403.75 = 668.07/x
  3. Step 3: Cross multiply
    1,016.78x = 1,403.75 × 668.07
  4. Step 4: Simplify right side
    1,016.78x = 937,799.92
  5. Step 5: Solve for x
    x = 937,799.92/1,016.78
  6. Step 6: Final answer
    x = 922.33

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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.