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Finding the Fourth Proportional to 998.99, 1,378.60 and 579.42

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Solution

The fourth proportional to 998.99, 1,378.60 and 579.42 is: 799.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.99 : 1,378.60 = 579.42 : x
  2. Step 2: Convert to fraction form
    998.99/1,378.60 = 579.42/x
  3. Step 3: Cross multiply
    998.99x = 1,378.60 × 579.42
  4. Step 4: Simplify right side
    998.99x = 798,788.41
  5. Step 5: Solve for x
    x = 798,788.41/998.99
  6. Step 6: Final answer
    x = 799.60

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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.