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Finding the Fourth Proportional to 406.40, 609.71 and 208.83

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Solution

The fourth proportional to 406.40, 609.71 and 208.83 is: 313.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.40 : 609.71 = 208.83 : x
  2. Step 2: Convert to fraction form
    406.40/609.71 = 208.83/x
  3. Step 3: Cross multiply
    406.40x = 609.71 × 208.83
  4. Step 4: Simplify right side
    406.40x = 127,324.73
  5. Step 5: Solve for x
    x = 127,324.73/406.40
  6. Step 6: Final answer
    x = 313.30

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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.