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Finding the Fourth Proportional to 513.20, 769.28 and 188.40

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Solution

The fourth proportional to 513.20, 769.28 and 188.40 is: 282.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.20 : 769.28 = 188.40 : x
  2. Step 2: Convert to fraction form
    513.20/769.28 = 188.40/x
  3. Step 3: Cross multiply
    513.20x = 769.28 × 188.40
  4. Step 4: Simplify right side
    513.20x = 144,932.35
  5. Step 5: Solve for x
    x = 144,932.35/513.20
  6. Step 6: Final answer
    x = 282.41

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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.