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Finding the Fourth Proportional to 1,199.97, 1,799.97 and 419.97

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Solution

The fourth proportional to 1,199.97, 1,799.97 and 419.97 is: 629.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.97 : 1,799.97 = 419.97 : x
  2. Step 2: Convert to fraction form
    1,199.97/1,799.97 = 419.97/x
  3. Step 3: Cross multiply
    1,199.97x = 1,799.97 × 419.97
  4. Step 4: Simplify right side
    1,199.97x = 755,933.40
  5. Step 5: Solve for x
    x = 755,933.40/1,199.97
  6. Step 6: Final answer
    x = 629.96

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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.