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Finding the Fourth Proportional to 201.89, 302.85 and 147.21

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Solution

The fourth proportional to 201.89, 302.85 and 147.21 is: 220.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.89 : 302.85 = 147.21 : x
  2. Step 2: Convert to fraction form
    201.89/302.85 = 147.21/x
  3. Step 3: Cross multiply
    201.89x = 302.85 × 147.21
  4. Step 4: Simplify right side
    201.89x = 44,582.55
  5. Step 5: Solve for x
    x = 44,582.55/201.89
  6. Step 6: Final answer
    x = 220.83

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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.