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Finding the Fourth Proportional to 998.28, 1,377.76 and 578.64

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Solution

The fourth proportional to 998.28, 1,377.76 and 578.64 is: 798.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.28 : 1,377.76 = 578.64 : x
  2. Step 2: Convert to fraction form
    998.28/1,377.76 = 578.64/x
  3. Step 3: Cross multiply
    998.28x = 1,377.76 × 578.64
  4. Step 4: Simplify right side
    998.28x = 797,232.94
  5. Step 5: Solve for x
    x = 797,232.94/998.28
  6. Step 6: Final answer
    x = 798.61

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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.