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Finding the Fourth Proportional to 998.33, 1,490.10 and 936.77

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Solution

The fourth proportional to 998.33, 1,490.10 and 936.77 is: 1,398.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.33 : 1,490.10 = 936.77 : x
  2. Step 2: Convert to fraction form
    998.33/1,490.10 = 936.77/x
  3. Step 3: Cross multiply
    998.33x = 1,490.10 × 936.77
  4. Step 4: Simplify right side
    998.33x = 1,395,870.01
  5. Step 5: Solve for x
    x = 1,395,870.01/998.33
  6. Step 6: Final answer
    x = 1,398.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.