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Finding the Fourth Proportional to 1,199.85, 1,799.79 and 419.82

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Solution

The fourth proportional to 1,199.85, 1,799.79 and 419.82 is: 629.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.85 : 1,799.79 = 419.82 : x
  2. Step 2: Convert to fraction form
    1,199.85/1,799.79 = 419.82/x
  3. Step 3: Cross multiply
    1,199.85x = 1,799.79 × 419.82
  4. Step 4: Simplify right side
    1,199.85x = 755,587.84
  5. Step 5: Solve for x
    x = 755,587.84/1,199.85
  6. Step 6: Final answer
    x = 629.74

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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.