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Finding the Fourth Proportional to 513.20, 769.91 and 188.57

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Solution

The fourth proportional to 513.20, 769.91 and 188.57 is: 282.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.20 : 769.91 = 188.57 : x
  2. Step 2: Convert to fraction form
    513.20/769.91 = 188.57/x
  3. Step 3: Cross multiply
    513.20x = 769.91 × 188.57
  4. Step 4: Simplify right side
    513.20x = 145,177.14
  5. Step 5: Solve for x
    x = 145,177.14/513.20
  6. Step 6: Final answer
    x = 282.89

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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.