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Finding the Fourth Proportional to 1,293.78, 1,783.92 and 939

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Solution

The fourth proportional to 1,293.78, 1,783.92 and 939 is: 1,294.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.78 : 1,783.92 = 939 : x
  2. Step 2: Convert to fraction form
    1,293.78/1,783.92 = 939/x
  3. Step 3: Cross multiply
    1,293.78x = 1,783.92 × 939
  4. Step 4: Simplify right side
    1,293.78x = 1,675,100.88
  5. Step 5: Solve for x
    x = 1,675,100.88/1,293.78
  6. Step 6: Final answer
    x = 1,294.73

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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.