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Finding the Fourth Proportional to 998.36, 1,377.75 and 556.25

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Solution

The fourth proportional to 998.36, 1,377.75 and 556.25 is: 767.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.36 : 1,377.75 = 556.25 : x
  2. Step 2: Convert to fraction form
    998.36/1,377.75 = 556.25/x
  3. Step 3: Cross multiply
    998.36x = 1,377.75 × 556.25
  4. Step 4: Simplify right side
    998.36x = 766,373.44
  5. Step 5: Solve for x
    x = 766,373.44/998.36
  6. Step 6: Final answer
    x = 767.63

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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.