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Finding the Fourth Proportional to 1,111.82, 1,668 and 381.40

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Solution

The fourth proportional to 1,111.82, 1,668 and 381.40 is: 572.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.82 : 1,668 = 381.40 : x
  2. Step 2: Convert to fraction form
    1,111.82/1,668 = 381.40/x
  3. Step 3: Cross multiply
    1,111.82x = 1,668 × 381.40
  4. Step 4: Simplify right side
    1,111.82x = 636,175.20
  5. Step 5: Solve for x
    x = 636,175.20/1,111.82
  6. Step 6: Final answer
    x = 572.19

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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.