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Finding the Fourth Proportional to 998.29, 1,377.09 and 625.19

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Solution

The fourth proportional to 998.29, 1,377.09 and 625.19 is: 862.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.29 : 1,377.09 = 625.19 : x
  2. Step 2: Convert to fraction form
    998.29/1,377.09 = 625.19/x
  3. Step 3: Cross multiply
    998.29x = 1,377.09 × 625.19
  4. Step 4: Simplify right side
    998.29x = 860,937.57
  5. Step 5: Solve for x
    x = 860,937.57/998.29
  6. Step 6: Final answer
    x = 862.42

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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.