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Finding the Fourth Proportional to 1,279.56, 1,764.36 and 999.84

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Solution

The fourth proportional to 1,279.56, 1,764.36 and 999.84 is: 1,378.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.56 : 1,764.36 = 999.84 : x
  2. Step 2: Convert to fraction form
    1,279.56/1,764.36 = 999.84/x
  3. Step 3: Cross multiply
    1,279.56x = 1,764.36 × 999.84
  4. Step 4: Simplify right side
    1,279.56x = 1,764,077.70
  5. Step 5: Solve for x
    x = 1,764,077.70/1,279.56
  6. Step 6: Final answer
    x = 1,378.66

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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.