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Finding the Fourth Proportional to 403.61, 604.71 and 221.13

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Solution

The fourth proportional to 403.61, 604.71 and 221.13 is: 331.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.61 : 604.71 = 221.13 : x
  2. Step 2: Convert to fraction form
    403.61/604.71 = 221.13/x
  3. Step 3: Cross multiply
    403.61x = 604.71 × 221.13
  4. Step 4: Simplify right side
    403.61x = 133,719.52
  5. Step 5: Solve for x
    x = 133,719.52/403.61
  6. Step 6: Final answer
    x = 331.31

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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.