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Finding the Fourth Proportional to 545.60, 818.85 and 221.21

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Solution

The fourth proportional to 545.60, 818.85 and 221.21 is: 332.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.60 : 818.85 = 221.21 : x
  2. Step 2: Convert to fraction form
    545.60/818.85 = 221.21/x
  3. Step 3: Cross multiply
    545.60x = 818.85 × 221.21
  4. Step 4: Simplify right side
    545.60x = 181,137.81
  5. Step 5: Solve for x
    x = 181,137.81/545.60
  6. Step 6: Final answer
    x = 332.00

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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.