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Finding the Fourth Proportional to 395.36, 545.61 and 220.71

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Solution

The fourth proportional to 395.36, 545.61 and 220.71 is: 304.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.36 : 545.61 = 220.71 : x
  2. Step 2: Convert to fraction form
    395.36/545.61 = 220.71/x
  3. Step 3: Cross multiply
    395.36x = 545.61 × 220.71
  4. Step 4: Simplify right side
    395.36x = 120,421.58
  5. Step 5: Solve for x
    x = 120,421.58/395.36
  6. Step 6: Final answer
    x = 304.59

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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.