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Finding the Fourth Proportional to 406.08, 608.85 and 213.30

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Solution

The fourth proportional to 406.08, 608.85 and 213.30 is: 319.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.08 : 608.85 = 213.30 : x
  2. Step 2: Convert to fraction form
    406.08/608.85 = 213.30/x
  3. Step 3: Cross multiply
    406.08x = 608.85 × 213.30
  4. Step 4: Simplify right side
    406.08x = 129,867.71
  5. Step 5: Solve for x
    x = 129,867.71/406.08
  6. Step 6: Final answer
    x = 319.81

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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.