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Finding the Fourth Proportional to 998.63, 1,379.18 and 684.70

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Solution

The fourth proportional to 998.63, 1,379.18 and 684.70 is: 945.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.63 : 1,379.18 = 684.70 : x
  2. Step 2: Convert to fraction form
    998.63/1,379.18 = 684.70/x
  3. Step 3: Cross multiply
    998.63x = 1,379.18 × 684.70
  4. Step 4: Simplify right side
    998.63x = 944,326.72
  5. Step 5: Solve for x
    x = 944,326.72/998.63
  6. Step 6: Final answer
    x = 945.62

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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.