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Finding the Fourth Proportional to 395.40, 545.64 and 220.74

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Solution

The fourth proportional to 395.40, 545.64 and 220.74 is: 304.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.40 : 545.64 = 220.74 : x
  2. Step 2: Convert to fraction form
    395.40/545.64 = 220.74/x
  3. Step 3: Cross multiply
    395.40x = 545.64 × 220.74
  4. Step 4: Simplify right side
    395.40x = 120,444.57
  5. Step 5: Solve for x
    x = 120,444.57/395.40
  6. Step 6: Final answer
    x = 304.61

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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.