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Finding the Fourth Proportional to 928.78, 1,392.09 and 495.70

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Solution

The fourth proportional to 928.78, 1,392.09 and 495.70 is: 742.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.78 : 1,392.09 = 495.70 : x
  2. Step 2: Convert to fraction form
    928.78/1,392.09 = 495.70/x
  3. Step 3: Cross multiply
    928.78x = 1,392.09 × 495.70
  4. Step 4: Simplify right side
    928.78x = 690,059.01
  5. Step 5: Solve for x
    x = 690,059.01/928.78
  6. Step 6: Final answer
    x = 742.97

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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.