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Finding the Fourth Proportional to 1,279.41, 1,765.63 and 999.55

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Solution

The fourth proportional to 1,279.41, 1,765.63 and 999.55 is: 1,379.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.41 : 1,765.63 = 999.55 : x
  2. Step 2: Convert to fraction form
    1,279.41/1,765.63 = 999.55/x
  3. Step 3: Cross multiply
    1,279.41x = 1,765.63 × 999.55
  4. Step 4: Simplify right side
    1,279.41x = 1,764,835.47
  5. Step 5: Solve for x
    x = 1,764,835.47/1,279.41
  6. Step 6: Final answer
    x = 1,379.41

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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.