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Finding the Fourth Proportional to 639.42, 956.97 and 571.74

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Solution

The fourth proportional to 639.42, 956.97 and 571.74 is: 855.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.42 : 956.97 = 571.74 : x
  2. Step 2: Convert to fraction form
    639.42/956.97 = 571.74/x
  3. Step 3: Cross multiply
    639.42x = 956.97 × 571.74
  4. Step 4: Simplify right side
    639.42x = 547,138.03
  5. Step 5: Solve for x
    x = 547,138.03/639.42
  6. Step 6: Final answer
    x = 855.68

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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.