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Finding the Fourth Proportional to 998.88, 1,378.76 and 579.43

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Solution

The fourth proportional to 998.88, 1,378.76 and 579.43 is: 799.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.88 : 1,378.76 = 579.43 : x
  2. Step 2: Convert to fraction form
    998.88/1,378.76 = 579.43/x
  3. Step 3: Cross multiply
    998.88x = 1,378.76 × 579.43
  4. Step 4: Simplify right side
    998.88x = 798,893.73
  5. Step 5: Solve for x
    x = 798,893.73/998.88
  6. Step 6: Final answer
    x = 799.79

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Half scale
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Double scale
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1.5x scale

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.