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Finding the Fourth Proportional to 998.91, 1,377.79 and 667.28

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Solution

The fourth proportional to 998.91, 1,377.79 and 667.28 is: 920.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.91 : 1,377.79 = 667.28 : x
  2. Step 2: Convert to fraction form
    998.91/1,377.79 = 667.28/x
  3. Step 3: Cross multiply
    998.91x = 1,377.79 × 667.28
  4. Step 4: Simplify right side
    998.91x = 919,373.49
  5. Step 5: Solve for x
    x = 919,373.49/998.91
  6. Step 6: Final answer
    x = 920.38

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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.