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Finding the Fourth Proportional to 998.73, 1,378.62 and 779.22

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Solution

The fourth proportional to 998.73, 1,378.62 and 779.22 is: 1,075.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.73 : 1,378.62 = 779.22 : x
  2. Step 2: Convert to fraction form
    998.73/1,378.62 = 779.22/x
  3. Step 3: Cross multiply
    998.73x = 1,378.62 × 779.22
  4. Step 4: Simplify right side
    998.73x = 1,074,248.28
  5. Step 5: Solve for x
    x = 1,074,248.28/998.73
  6. Step 6: Final answer
    x = 1,075.61

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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.