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Finding the Fourth Proportional to 636.71, 953.53 and 515.21

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Solution

The fourth proportional to 636.71, 953.53 and 515.21 is: 771.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.71 : 953.53 = 515.21 : x
  2. Step 2: Convert to fraction form
    636.71/953.53 = 515.21/x
  3. Step 3: Cross multiply
    636.71x = 953.53 × 515.21
  4. Step 4: Simplify right side
    636.71x = 491,262.14
  5. Step 5: Solve for x
    x = 491,262.14/636.71
  6. Step 6: Final answer
    x = 771.57

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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.