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Finding the Fourth Proportional to 928.70, 1,391.82 and 518.03

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Solution

The fourth proportional to 928.70, 1,391.82 and 518.03 is: 776.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.70 : 1,391.82 = 518.03 : x
  2. Step 2: Convert to fraction form
    928.70/1,391.82 = 518.03/x
  3. Step 3: Cross multiply
    928.70x = 1,391.82 × 518.03
  4. Step 4: Simplify right side
    928.70x = 720,997.56
  5. Step 5: Solve for x
    x = 720,997.56/928.70
  6. Step 6: Final answer
    x = 776.36

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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.