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Finding the Fourth Proportional to 998.37, 1,377.75 and 556.27

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Solution

The fourth proportional to 998.37, 1,377.75 and 556.27 is: 767.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.37 : 1,377.75 = 556.27 : x
  2. Step 2: Convert to fraction form
    998.37/1,377.75 = 556.27/x
  3. Step 3: Cross multiply
    998.37x = 1,377.75 × 556.27
  4. Step 4: Simplify right side
    998.37x = 766,400.99
  5. Step 5: Solve for x
    x = 766,400.99/998.37
  6. Step 6: Final answer
    x = 767.65

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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.