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Finding the Fourth Proportional to 636.89, 953.49 and 515.39

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Solution

The fourth proportional to 636.89, 953.49 and 515.39 is: 771.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.89 : 953.49 = 515.39 : x
  2. Step 2: Convert to fraction form
    636.89/953.49 = 515.39/x
  3. Step 3: Cross multiply
    636.89x = 953.49 × 515.39
  4. Step 4: Simplify right side
    636.89x = 491,419.21
  5. Step 5: Solve for x
    x = 491,419.21/636.89
  6. Step 6: Final answer
    x = 771.59

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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.