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Finding the Fourth Proportional to 998.97, 1,498.97 and 559.95

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Solution

The fourth proportional to 998.97, 1,498.97 and 559.95 is: 840.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.97 : 1,498.97 = 559.95 : x
  2. Step 2: Convert to fraction form
    998.97/1,498.97 = 559.95/x
  3. Step 3: Cross multiply
    998.97x = 1,498.97 × 559.95
  4. Step 4: Simplify right side
    998.97x = 839,348.25
  5. Step 5: Solve for x
    x = 839,348.25/998.97
  6. Step 6: Final answer
    x = 840.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.