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Finding the Fourth Proportional to 219.45, 302.80 and 126.18

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Solution

The fourth proportional to 219.45, 302.80 and 126.18 is: 174.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.45 : 302.80 = 126.18 : x
  2. Step 2: Convert to fraction form
    219.45/302.80 = 126.18/x
  3. Step 3: Cross multiply
    219.45x = 302.80 × 126.18
  4. Step 4: Simplify right side
    219.45x = 38,207.30
  5. Step 5: Solve for x
    x = 38,207.30/219.45
  6. Step 6: Final answer
    x = 174.10

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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.