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Finding the Fourth Proportional to 1,199.69, 1,799.41 and 419.62

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Solution

The fourth proportional to 1,199.69, 1,799.41 and 419.62 is: 629.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.69 : 1,799.41 = 419.62 : x
  2. Step 2: Convert to fraction form
    1,199.69/1,799.41 = 419.62/x
  3. Step 3: Cross multiply
    1,199.69x = 1,799.41 × 419.62
  4. Step 4: Simplify right side
    1,199.69x = 755,068.42
  5. Step 5: Solve for x
    x = 755,068.42/1,199.69
  6. Step 6: Final answer
    x = 629.39

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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.