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Finding the Fourth Proportional to 512.85, 769.20 and 147.60

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Solution

The fourth proportional to 512.85, 769.20 and 147.60 is: 221.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.85 : 769.20 = 147.60 : x
  2. Step 2: Convert to fraction form
    512.85/769.20 = 147.60/x
  3. Step 3: Cross multiply
    512.85x = 769.20 × 147.60
  4. Step 4: Simplify right side
    512.85x = 113,533.92
  5. Step 5: Solve for x
    x = 113,533.92/512.85
  6. Step 6: Final answer
    x = 221.38

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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.