Home / 1,112.28-1,668.40-381.86

Finding the Fourth Proportional to 1,112.28, 1,668.40 and 381.86

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Solution

The fourth proportional to 1,112.28, 1,668.40 and 381.86 is: 572.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.28 : 1,668.40 = 381.86 : x
  2. Step 2: Convert to fraction form
    1,112.28/1,668.40 = 381.86/x
  3. Step 3: Cross multiply
    1,112.28x = 1,668.40 × 381.86
  4. Step 4: Simplify right side
    1,112.28x = 637,095.22
  5. Step 5: Solve for x
    x = 637,095.22/1,112.28
  6. Step 6: Final answer
    x = 572.78

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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.