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Finding the Fourth Proportional to 219.41, 302.78 and 126.15

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Solution

The fourth proportional to 219.41, 302.78 and 126.15 is: 174.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.41 : 302.78 = 126.15 : x
  2. Step 2: Convert to fraction form
    219.41/302.78 = 126.15/x
  3. Step 3: Cross multiply
    219.41x = 302.78 × 126.15
  4. Step 4: Simplify right side
    219.41x = 38,196.28
  5. Step 5: Solve for x
    x = 38,196.28/219.41
  6. Step 6: Final answer
    x = 174.09

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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.