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Finding the Fourth Proportional to 998.63, 1,378.10 and 584.63

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Solution

The fourth proportional to 998.63, 1,378.10 and 584.63 is: 806.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.63 : 1,378.10 = 584.63 : x
  2. Step 2: Convert to fraction form
    998.63/1,378.10 = 584.63/x
  3. Step 3: Cross multiply
    998.63x = 1,378.10 × 584.63
  4. Step 4: Simplify right side
    998.63x = 805,678.60
  5. Step 5: Solve for x
    x = 805,678.60/998.63
  6. Step 6: Final answer
    x = 806.78

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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.