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Finding the Fourth Proportional to 406.31, 609.74 and 379.31

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Solution

The fourth proportional to 406.31, 609.74 and 379.31 is: 569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.31 : 609.74 = 379.31 : x
  2. Step 2: Convert to fraction form
    406.31/609.74 = 379.31/x
  3. Step 3: Cross multiply
    406.31x = 609.74 × 379.31
  4. Step 4: Simplify right side
    406.31x = 231,278.58
  5. Step 5: Solve for x
    x = 231,278.58/406.31
  6. Step 6: Final answer
    x = 569.22

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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.