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Finding the Fourth Proportional to 998.26, 1,377.90 and 578.71

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Solution

The fourth proportional to 998.26, 1,377.90 and 578.71 is: 798.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.26 : 1,377.90 = 578.71 : x
  2. Step 2: Convert to fraction form
    998.26/1,377.90 = 578.71/x
  3. Step 3: Cross multiply
    998.26x = 1,377.90 × 578.71
  4. Step 4: Simplify right side
    998.26x = 797,406.23
  5. Step 5: Solve for x
    x = 797,406.23/998.26
  6. Step 6: Final answer
    x = 798.80

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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.