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Finding the Fourth Proportional to 998.16, 1,377.96 and 667.12

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Solution

The fourth proportional to 998.16, 1,377.96 and 667.12 is: 920.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.16 : 1,377.96 = 667.12 : x
  2. Step 2: Convert to fraction form
    998.16/1,377.96 = 667.12/x
  3. Step 3: Cross multiply
    998.16x = 1,377.96 × 667.12
  4. Step 4: Simplify right side
    998.16x = 919,264.68
  5. Step 5: Solve for x
    x = 919,264.68/998.16
  6. Step 6: Final answer
    x = 920.96

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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.