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Finding the Fourth Proportional to 545.80, 818.78 and 221.14

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Solution

The fourth proportional to 545.80, 818.78 and 221.14 is: 331.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.80 : 818.78 = 221.14 : x
  2. Step 2: Convert to fraction form
    545.80/818.78 = 221.14/x
  3. Step 3: Cross multiply
    545.80x = 818.78 × 221.14
  4. Step 4: Simplify right side
    545.80x = 181,065.01
  5. Step 5: Solve for x
    x = 181,065.01/545.80
  6. Step 6: Final answer
    x = 331.74

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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.