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Finding the Fourth Proportional to 219.50, 302.81 and 126.21

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Solution

The fourth proportional to 219.50, 302.81 and 126.21 is: 174.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.50 : 302.81 = 126.21 : x
  2. Step 2: Convert to fraction form
    219.50/302.81 = 126.21/x
  3. Step 3: Cross multiply
    219.50x = 302.81 × 126.21
  4. Step 4: Simplify right side
    219.50x = 38,217.02
  5. Step 5: Solve for x
    x = 38,217.02/219.50
  6. Step 6: Final answer
    x = 174.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.