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Finding the Fourth Proportional to 394.91, 545.02 and 220.25

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Solution

The fourth proportional to 394.91, 545.02 and 220.25 is: 303.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.91 : 545.02 = 220.25 : x
  2. Step 2: Convert to fraction form
    394.91/545.02 = 220.25/x
  3. Step 3: Cross multiply
    394.91x = 545.02 × 220.25
  4. Step 4: Simplify right side
    394.91x = 120,041.47
  5. Step 5: Solve for x
    x = 120,041.47/394.91
  6. Step 6: Final answer
    x = 303.97

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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.