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Finding the Fourth Proportional to 998.25, 1,377.60 and 605.28

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Solution

The fourth proportional to 998.25, 1,377.60 and 605.28 is: 835.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.25 : 1,377.60 = 605.28 : x
  2. Step 2: Convert to fraction form
    998.25/1,377.60 = 605.28/x
  3. Step 3: Cross multiply
    998.25x = 1,377.60 × 605.28
  4. Step 4: Simplify right side
    998.25x = 833,833.73
  5. Step 5: Solve for x
    x = 833,833.73/998.25
  6. Step 6: Final answer
    x = 835.30

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Double scale
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1.5x scale

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.