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Finding the Fourth Proportional to 998.73, 1,378.20 and 579.12

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Solution

The fourth proportional to 998.73, 1,378.20 and 579.12 is: 799.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.73 : 1,378.20 = 579.12 : x
  2. Step 2: Convert to fraction form
    998.73/1,378.20 = 579.12/x
  3. Step 3: Cross multiply
    998.73x = 1,378.20 × 579.12
  4. Step 4: Simplify right side
    998.73x = 798,143.18
  5. Step 5: Solve for x
    x = 798,143.18/998.73
  6. Step 6: Final answer
    x = 799.16

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Double scale
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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.