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Finding the Fourth Proportional to 1,111.98, 1,668.22 and 381.58

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Solution

The fourth proportional to 1,111.98, 1,668.22 and 381.58 is: 572.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.98 : 1,668.22 = 381.58 : x
  2. Step 2: Convert to fraction form
    1,111.98/1,668.22 = 381.58/x
  3. Step 3: Cross multiply
    1,111.98x = 1,668.22 × 381.58
  4. Step 4: Simplify right side
    1,111.98x = 636,554.26
  5. Step 5: Solve for x
    x = 636,554.26/1,111.98
  6. Step 6: Final answer
    x = 572.45

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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.