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Finding the Fourth Proportional to 928.73, 1,391.26 and 668.11

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Solution

The fourth proportional to 928.73, 1,391.26 and 668.11 is: 1,000.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.73 : 1,391.26 = 668.11 : x
  2. Step 2: Convert to fraction form
    928.73/1,391.26 = 668.11/x
  3. Step 3: Cross multiply
    928.73x = 1,391.26 × 668.11
  4. Step 4: Simplify right side
    928.73x = 929,514.01
  5. Step 5: Solve for x
    x = 929,514.01/928.73
  6. Step 6: Final answer
    x = 1,000.85

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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.