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Finding the Fourth Proportional to 1,112.60, 1,668.90 and 382.19

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Solution

The fourth proportional to 1,112.60, 1,668.90 and 382.19 is: 573.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.60 : 1,668.90 = 382.19 : x
  2. Step 2: Convert to fraction form
    1,112.60/1,668.90 = 382.19/x
  3. Step 3: Cross multiply
    1,112.60x = 1,668.90 × 382.19
  4. Step 4: Simplify right side
    1,112.60x = 637,829.98
  5. Step 5: Solve for x
    x = 637,829.98/1,112.60
  6. Step 6: Final answer
    x = 573.28

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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.