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Finding the Fourth Proportional to 545.45, 817.68 and 220.60

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Solution

The fourth proportional to 545.45, 817.68 and 220.60 is: 330.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.45 : 817.68 = 220.60 : x
  2. Step 2: Convert to fraction form
    545.45/817.68 = 220.60/x
  3. Step 3: Cross multiply
    545.45x = 817.68 × 220.60
  4. Step 4: Simplify right side
    545.45x = 180,380.21
  5. Step 5: Solve for x
    x = 180,380.21/545.45
  6. Step 6: Final answer
    x = 330.70

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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.