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Finding the Fourth Proportional to 513.32, 769.96 and 128.56

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Solution

The fourth proportional to 513.32, 769.96 and 128.56 is: 192.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.32 : 769.96 = 128.56 : x
  2. Step 2: Convert to fraction form
    513.32/769.96 = 128.56/x
  3. Step 3: Cross multiply
    513.32x = 769.96 × 128.56
  4. Step 4: Simplify right side
    513.32x = 98,986.06
  5. Step 5: Solve for x
    x = 98,986.06/513.32
  6. Step 6: Final answer
    x = 192.83

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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.