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Finding the Fourth Proportional to 545.53, 818.29 and 220.81

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Solution

The fourth proportional to 545.53, 818.29 and 220.81 is: 331.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.53 : 818.29 = 220.81 : x
  2. Step 2: Convert to fraction form
    545.53/818.29 = 220.81/x
  3. Step 3: Cross multiply
    545.53x = 818.29 × 220.81
  4. Step 4: Simplify right side
    545.53x = 180,686.61
  5. Step 5: Solve for x
    x = 180,686.61/545.53
  6. Step 6: Final answer
    x = 331.21

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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.