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Finding the Fourth Proportional to 515.07, 771.72 and 254.72

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Solution

The fourth proportional to 515.07, 771.72 and 254.72 is: 381.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.07 : 771.72 = 254.72 : x
  2. Step 2: Convert to fraction form
    515.07/771.72 = 254.72/x
  3. Step 3: Cross multiply
    515.07x = 771.72 × 254.72
  4. Step 4: Simplify right side
    515.07x = 196,568.66
  5. Step 5: Solve for x
    x = 196,568.66/515.07
  6. Step 6: Final answer
    x = 381.63

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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.