Home / 1,112.20-1,668.90-454.43

Finding the Fourth Proportional to 1,112.20, 1,668.90 and 454.43

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Solution

The fourth proportional to 1,112.20, 1,668.90 and 454.43 is: 681.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.20 : 1,668.90 = 454.43 : x
  2. Step 2: Convert to fraction form
    1,112.20/1,668.90 = 454.43/x
  3. Step 3: Cross multiply
    1,112.20x = 1,668.90 × 454.43
  4. Step 4: Simplify right side
    1,112.20x = 758,404.10
  5. Step 5: Solve for x
    x = 758,404.10/1,112.20
  6. Step 6: Final answer
    x = 681.90

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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.