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Finding the Fourth Proportional to 403.88, 606.10 and 221.40

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Solution

The fourth proportional to 403.88, 606.10 and 221.40 is: 332.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.88 : 606.10 = 221.40 : x
  2. Step 2: Convert to fraction form
    403.88/606.10 = 221.40/x
  3. Step 3: Cross multiply
    403.88x = 606.10 × 221.40
  4. Step 4: Simplify right side
    403.88x = 134,190.54
  5. Step 5: Solve for x
    x = 134,190.54/403.88
  6. Step 6: Final answer
    x = 332.25

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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.