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Finding the Fourth Proportional to 928.78, 1,391.78 and 796.30

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Solution

The fourth proportional to 928.78, 1,391.78 and 796.30 is: 1,193.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.78 : 1,391.78 = 796.30 : x
  2. Step 2: Convert to fraction form
    928.78/1,391.78 = 796.30/x
  3. Step 3: Cross multiply
    928.78x = 1,391.78 × 796.30
  4. Step 4: Simplify right side
    928.78x = 1,108,274.41
  5. Step 5: Solve for x
    x = 1,108,274.41/928.78
  6. Step 6: Final answer
    x = 1,193.26

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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.