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Finding the Fourth Proportional to 1,112.48, 1,669 and 419.14

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Solution

The fourth proportional to 1,112.48, 1,669 and 419.14 is: 628.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.48 : 1,669 = 419.14 : x
  2. Step 2: Convert to fraction form
    1,112.48/1,669 = 419.14/x
  3. Step 3: Cross multiply
    1,112.48x = 1,669 × 419.14
  4. Step 4: Simplify right side
    1,112.48x = 699,544.66
  5. Step 5: Solve for x
    x = 699,544.66/1,112.48
  6. Step 6: Final answer
    x = 628.82

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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.