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Finding the Fourth Proportional to 394.97, 545.10 and 220.31

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Solution

The fourth proportional to 394.97, 545.10 and 220.31 is: 304.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.97 : 545.10 = 220.31 : x
  2. Step 2: Convert to fraction form
    394.97/545.10 = 220.31/x
  3. Step 3: Cross multiply
    394.97x = 545.10 × 220.31
  4. Step 4: Simplify right side
    394.97x = 120,090.98
  5. Step 5: Solve for x
    x = 120,090.98/394.97
  6. Step 6: Final answer
    x = 304.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.