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Finding the Fourth Proportional to 998.66, 1,377.77 and 625.49

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Solution

The fourth proportional to 998.66, 1,377.77 and 625.49 is: 862.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.66 : 1,377.77 = 625.49 : x
  2. Step 2: Convert to fraction form
    998.66/1,377.77 = 625.49/x
  3. Step 3: Cross multiply
    998.66x = 1,377.77 × 625.49
  4. Step 4: Simplify right side
    998.66x = 861,781.36
  5. Step 5: Solve for x
    x = 861,781.36/998.66
  6. Step 6: Final answer
    x = 862.94

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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.