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Finding the Fourth Proportional to 1,278.33, 1,764.77 and 997.94

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Solution

The fourth proportional to 1,278.33, 1,764.77 and 997.94 is: 1,377.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.33 : 1,764.77 = 997.94 : x
  2. Step 2: Convert to fraction form
    1,278.33/1,764.77 = 997.94/x
  3. Step 3: Cross multiply
    1,278.33x = 1,764.77 × 997.94
  4. Step 4: Simplify right side
    1,278.33x = 1,761,120.76
  5. Step 5: Solve for x
    x = 1,761,120.76/1,278.33
  6. Step 6: Final answer
    x = 1,377.67

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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.