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Finding the Fourth Proportional to 639.24, 956.70 and 516.12

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Solution

The fourth proportional to 639.24, 956.70 and 516.12 is: 772.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.24 : 956.70 = 516.12 : x
  2. Step 2: Convert to fraction form
    639.24/956.70 = 516.12/x
  3. Step 3: Cross multiply
    639.24x = 956.70 × 516.12
  4. Step 4: Simplify right side
    639.24x = 493,772.00
  5. Step 5: Solve for x
    x = 493,772.00/639.24
  6. Step 6: Final answer
    x = 772.44

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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.