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Finding the Fourth Proportional to 638.96, 956.84 and 445.68

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Solution

The fourth proportional to 638.96, 956.84 and 445.68 is: 667.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.96 : 956.84 = 445.68 : x
  2. Step 2: Convert to fraction form
    638.96/956.84 = 445.68/x
  3. Step 3: Cross multiply
    638.96x = 956.84 × 445.68
  4. Step 4: Simplify right side
    638.96x = 426,444.45
  5. Step 5: Solve for x
    x = 426,444.45/638.96
  6. Step 6: Final answer
    x = 667.40

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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.