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Finding the Fourth Proportional to 638.08, 956.51 and 406.32

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Solution

The fourth proportional to 638.08, 956.51 and 406.32 is: 609.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.08 : 956.51 = 406.32 : x
  2. Step 2: Convert to fraction form
    638.08/956.51 = 406.32/x
  3. Step 3: Cross multiply
    638.08x = 956.51 × 406.32
  4. Step 4: Simplify right side
    638.08x = 388,645.05
  5. Step 5: Solve for x
    x = 388,645.05/638.08
  6. Step 6: Final answer
    x = 609.09

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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.