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Finding the Fourth Proportional to 1,112.57, 1,668.98 and 419.83

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Solution

The fourth proportional to 1,112.57, 1,668.98 and 419.83 is: 629.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.57 : 1,668.98 = 419.83 : x
  2. Step 2: Convert to fraction form
    1,112.57/1,668.98 = 419.83/x
  3. Step 3: Cross multiply
    1,112.57x = 1,668.98 × 419.83
  4. Step 4: Simplify right side
    1,112.57x = 700,679.26
  5. Step 5: Solve for x
    x = 700,679.26/1,112.57
  6. Step 6: Final answer
    x = 629.78

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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.