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Finding the Fourth Proportional to 395.05, 545.11 and 220.40

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Solution

The fourth proportional to 395.05, 545.11 and 220.40 is: 304.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.05 : 545.11 = 220.40 : x
  2. Step 2: Convert to fraction form
    395.05/545.11 = 220.40/x
  3. Step 3: Cross multiply
    395.05x = 545.11 × 220.40
  4. Step 4: Simplify right side
    395.05x = 120,139.52
  5. Step 5: Solve for x
    x = 120,139.52/395.05
  6. Step 6: Final answer
    x = 304.11

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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.