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Finding the Fourth Proportional to 545.80, 818.70 and 221.08

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Solution

The fourth proportional to 545.80, 818.70 and 221.08 is: 331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.80 : 818.70 = 221.08 : x
  2. Step 2: Convert to fraction form
    545.80/818.70 = 221.08/x
  3. Step 3: Cross multiply
    545.80x = 818.70 × 221.08
  4. Step 4: Simplify right side
    545.80x = 180,998.20
  5. Step 5: Solve for x
    x = 180,998.20/545.80
  6. Step 6: Final answer
    x = 331.62

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Similar ratio
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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.