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Finding the Fourth Proportional to 1,112.53, 1,668.37 and 381.91

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Solution

The fourth proportional to 1,112.53, 1,668.37 and 381.91 is: 572.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.53 : 1,668.37 = 381.91 : x
  2. Step 2: Convert to fraction form
    1,112.53/1,668.37 = 381.91/x
  3. Step 3: Cross multiply
    1,112.53x = 1,668.37 × 381.91
  4. Step 4: Simplify right side
    1,112.53x = 637,167.19
  5. Step 5: Solve for x
    x = 637,167.19/1,112.53
  6. Step 6: Final answer
    x = 572.72

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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.