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Finding the Fourth Proportional to 1,111.97, 1,668.20 and 381.35

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Solution

The fourth proportional to 1,111.97, 1,668.20 and 381.35 is: 572.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.97 : 1,668.20 = 381.35 : x
  2. Step 2: Convert to fraction form
    1,111.97/1,668.20 = 381.35/x
  3. Step 3: Cross multiply
    1,111.97x = 1,668.20 × 381.35
  4. Step 4: Simplify right side
    1,111.97x = 636,170.33
  5. Step 5: Solve for x
    x = 636,170.33/1,111.97
  6. Step 6: Final answer
    x = 572.11

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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.