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Finding the Fourth Proportional to 999.14, 1,378.64 and 579.54

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Solution

The fourth proportional to 999.14, 1,378.64 and 579.54 is: 799.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.14 : 1,378.64 = 579.54 : x
  2. Step 2: Convert to fraction form
    999.14/1,378.64 = 579.54/x
  3. Step 3: Cross multiply
    999.14x = 1,378.64 × 579.54
  4. Step 4: Simplify right side
    999.14x = 798,974.13
  5. Step 5: Solve for x
    x = 798,974.13/999.14
  6. Step 6: Final answer
    x = 799.67

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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.