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Finding the Fourth Proportional to 516.21, 773.95 and 255.90

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Solution

The fourth proportional to 516.21, 773.95 and 255.90 is: 383.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.21 : 773.95 = 255.90 : x
  2. Step 2: Convert to fraction form
    516.21/773.95 = 255.90/x
  3. Step 3: Cross multiply
    516.21x = 773.95 × 255.90
  4. Step 4: Simplify right side
    516.21x = 198,053.81
  5. Step 5: Solve for x
    x = 198,053.81/516.21
  6. Step 6: Final answer
    x = 383.67

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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.