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Finding the Fourth Proportional to 998.43, 1,379.73 and 719.58

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Solution

The fourth proportional to 998.43, 1,379.73 and 719.58 is: 994.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.43 : 1,379.73 = 719.58 : x
  2. Step 2: Convert to fraction form
    998.43/1,379.73 = 719.58/x
  3. Step 3: Cross multiply
    998.43x = 1,379.73 × 719.58
  4. Step 4: Simplify right side
    998.43x = 992,833.99
  5. Step 5: Solve for x
    x = 992,833.99/998.43
  6. Step 6: Final answer
    x = 994.40

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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.