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Finding the Fourth Proportional to 406.17, 609.08 and 213.93

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Solution

The fourth proportional to 406.17, 609.08 and 213.93 is: 320.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.17 : 609.08 = 213.93 : x
  2. Step 2: Convert to fraction form
    406.17/609.08 = 213.93/x
  3. Step 3: Cross multiply
    406.17x = 609.08 × 213.93
  4. Step 4: Simplify right side
    406.17x = 130,299.41
  5. Step 5: Solve for x
    x = 130,299.41/406.17
  6. Step 6: Final answer
    x = 320.80

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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.