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Finding the Fourth Proportional to 998.19, 1,377.29 and 605.31

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Solution

The fourth proportional to 998.19, 1,377.29 and 605.31 is: 835.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.19 : 1,377.29 = 605.31 : x
  2. Step 2: Convert to fraction form
    998.19/1,377.29 = 605.31/x
  3. Step 3: Cross multiply
    998.19x = 1,377.29 × 605.31
  4. Step 4: Simplify right side
    998.19x = 833,684.38
  5. Step 5: Solve for x
    x = 833,684.38/998.19
  6. Step 6: Final answer
    x = 835.20

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Double scale
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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.