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Finding the Fourth Proportional to 513.60, 769.85 and 188.79

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Solution

The fourth proportional to 513.60, 769.85 and 188.79 is: 282.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.60 : 769.85 = 188.79 : x
  2. Step 2: Convert to fraction form
    513.60/769.85 = 188.79/x
  3. Step 3: Cross multiply
    513.60x = 769.85 × 188.79
  4. Step 4: Simplify right side
    513.60x = 145,339.98
  5. Step 5: Solve for x
    x = 145,339.98/513.60
  6. Step 6: Final answer
    x = 282.98

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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.