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Finding the Fourth Proportional to 394.90, 545.02 and 220.28

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Solution

The fourth proportional to 394.90, 545.02 and 220.28 is: 304.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.90 : 545.02 = 220.28 : x
  2. Step 2: Convert to fraction form
    394.90/545.02 = 220.28/x
  3. Step 3: Cross multiply
    394.90x = 545.02 × 220.28
  4. Step 4: Simplify right side
    394.90x = 120,057.01
  5. Step 5: Solve for x
    x = 120,057.01/394.90
  6. Step 6: Final answer
    x = 304.02

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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.