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Finding the Fourth Proportional to 998.12, 1,377.42 and 605.18

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Solution

The fourth proportional to 998.12, 1,377.42 and 605.18 is: 835.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.12 : 1,377.42 = 605.18 : x
  2. Step 2: Convert to fraction form
    998.12/1,377.42 = 605.18/x
  3. Step 3: Cross multiply
    998.12x = 1,377.42 × 605.18
  4. Step 4: Simplify right side
    998.12x = 833,587.04
  5. Step 5: Solve for x
    x = 833,587.04/998.12
  6. Step 6: Final answer
    x = 835.16

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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.