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Finding the Fourth Proportional to 515.21, 772.88 and 255.69

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Solution

The fourth proportional to 515.21, 772.88 and 255.69 is: 383.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.21 : 772.88 = 255.69 : x
  2. Step 2: Convert to fraction form
    515.21/772.88 = 255.69/x
  3. Step 3: Cross multiply
    515.21x = 772.88 × 255.69
  4. Step 4: Simplify right side
    515.21x = 197,616.41
  5. Step 5: Solve for x
    x = 197,616.41/515.21
  6. Step 6: Final answer
    x = 383.57

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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.