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Finding the Fourth Proportional to 636.85, 956.41 and 521.51

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Solution

The fourth proportional to 636.85, 956.41 and 521.51 is: 783.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.85 : 956.41 = 521.51 : x
  2. Step 2: Convert to fraction form
    636.85/956.41 = 521.51/x
  3. Step 3: Cross multiply
    636.85x = 956.41 × 521.51
  4. Step 4: Simplify right side
    636.85x = 498,778.47
  5. Step 5: Solve for x
    x = 498,778.47/636.85
  6. Step 6: Final answer
    x = 783.20

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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.