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Finding the Fourth Proportional to 998.38, 1,377.60 and 578.80

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Solution

The fourth proportional to 998.38, 1,377.60 and 578.80 is: 798.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.38 : 1,377.60 = 578.80 : x
  2. Step 2: Convert to fraction form
    998.38/1,377.60 = 578.80/x
  3. Step 3: Cross multiply
    998.38x = 1,377.60 × 578.80
  4. Step 4: Simplify right side
    998.38x = 797,354.88
  5. Step 5: Solve for x
    x = 797,354.88/998.38
  6. Step 6: Final answer
    x = 798.65

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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.