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Finding the Fourth Proportional to 406.38, 609.54 and 211.38

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Solution

The fourth proportional to 406.38, 609.54 and 211.38 is: 317.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.38 : 609.54 = 211.38 : x
  2. Step 2: Convert to fraction form
    406.38/609.54 = 211.38/x
  3. Step 3: Cross multiply
    406.38x = 609.54 × 211.38
  4. Step 4: Simplify right side
    406.38x = 128,844.57
  5. Step 5: Solve for x
    x = 128,844.57/406.38
  6. Step 6: Final answer
    x = 317.05

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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.