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Finding the Fourth Proportional to 1,112.69, 1,668.92 and 382.31

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Solution

The fourth proportional to 1,112.69, 1,668.92 and 382.31 is: 573.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.69 : 1,668.92 = 382.31 : x
  2. Step 2: Convert to fraction form
    1,112.69/1,668.92 = 382.31/x
  3. Step 3: Cross multiply
    1,112.69x = 1,668.92 × 382.31
  4. Step 4: Simplify right side
    1,112.69x = 638,047.07
  5. Step 5: Solve for x
    x = 638,047.07/1,112.69
  6. Step 6: Final answer
    x = 573.43

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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.