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Finding the Fourth Proportional to 545.20, 817.64 and 220.72

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Solution

The fourth proportional to 545.20, 817.64 and 220.72 is: 331.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.20 : 817.64 = 220.72 : x
  2. Step 2: Convert to fraction form
    545.20/817.64 = 220.72/x
  3. Step 3: Cross multiply
    545.20x = 817.64 × 220.72
  4. Step 4: Simplify right side
    545.20x = 180,469.50
  5. Step 5: Solve for x
    x = 180,469.50/545.20
  6. Step 6: Final answer
    x = 331.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.