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Finding the Fourth Proportional to 545.39, 818.46 and 220.76

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Solution

The fourth proportional to 545.39, 818.46 and 220.76 is: 331.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.39 : 818.46 = 220.76 : x
  2. Step 2: Convert to fraction form
    545.39/818.46 = 220.76/x
  3. Step 3: Cross multiply
    545.39x = 818.46 × 220.76
  4. Step 4: Simplify right side
    545.39x = 180,683.23
  5. Step 5: Solve for x
    x = 180,683.23/545.39
  6. Step 6: Final answer
    x = 331.29

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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.