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Finding the Fourth Proportional to 998.83, 1,378.50 and 573.61

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Solution

The fourth proportional to 998.83, 1,378.50 and 573.61 is: 791.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.83 : 1,378.50 = 573.61 : x
  2. Step 2: Convert to fraction form
    998.83/1,378.50 = 573.61/x
  3. Step 3: Cross multiply
    998.83x = 1,378.50 × 573.61
  4. Step 4: Simplify right side
    998.83x = 790,721.39
  5. Step 5: Solve for x
    x = 790,721.39/998.83
  6. Step 6: Final answer
    x = 791.65

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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.