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Finding the Fourth Proportional to 998.42, 1,377.77 and 556.36

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Solution

The fourth proportional to 998.42, 1,377.77 and 556.36 is: 767.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.42 : 1,377.77 = 556.36 : x
  2. Step 2: Convert to fraction form
    998.42/1,377.77 = 556.36/x
  3. Step 3: Cross multiply
    998.42x = 1,377.77 × 556.36
  4. Step 4: Simplify right side
    998.42x = 766,536.12
  5. Step 5: Solve for x
    x = 766,536.12/998.42
  6. Step 6: Final answer
    x = 767.75

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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.