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Finding the Fourth Proportional to 1,010.44, 1,394.88 and 678.73

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Solution

The fourth proportional to 1,010.44, 1,394.88 and 678.73 is: 936.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.44 : 1,394.88 = 678.73 : x
  2. Step 2: Convert to fraction form
    1,010.44/1,394.88 = 678.73/x
  3. Step 3: Cross multiply
    1,010.44x = 1,394.88 × 678.73
  4. Step 4: Simplify right side
    1,010.44x = 946,746.90
  5. Step 5: Solve for x
    x = 946,746.90/1,010.44
  6. Step 6: Final answer
    x = 936.96

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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.