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Finding the Fourth Proportional to 998.39, 1,377.88 and 556.34

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Solution

The fourth proportional to 998.39, 1,377.88 and 556.34 is: 767.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.39 : 1,377.88 = 556.34 : x
  2. Step 2: Convert to fraction form
    998.39/1,377.88 = 556.34/x
  3. Step 3: Cross multiply
    998.39x = 1,377.88 × 556.34
  4. Step 4: Simplify right side
    998.39x = 766,561.48
  5. Step 5: Solve for x
    x = 766,561.48/998.39
  6. Step 6: Final answer
    x = 767.80

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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.