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Finding the Fourth Proportional to 403.99, 606.30 and 221.59

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Solution

The fourth proportional to 403.99, 606.30 and 221.59 is: 332.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.99 : 606.30 = 221.59 : x
  2. Step 2: Convert to fraction form
    403.99/606.30 = 221.59/x
  3. Step 3: Cross multiply
    403.99x = 606.30 × 221.59
  4. Step 4: Simplify right side
    403.99x = 134,350.02
  5. Step 5: Solve for x
    x = 134,350.02/403.99
  6. Step 6: Final answer
    x = 332.56

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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.