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Finding the Fourth Proportional to 219.20, 302.46 and 136.40

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Solution

The fourth proportional to 219.20, 302.46 and 136.40 is: 188.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.20 : 302.46 = 136.40 : x
  2. Step 2: Convert to fraction form
    219.20/302.46 = 136.40/x
  3. Step 3: Cross multiply
    219.20x = 302.46 × 136.40
  4. Step 4: Simplify right side
    219.20x = 41,255.54
  5. Step 5: Solve for x
    x = 41,255.54/219.20
  6. Step 6: Final answer
    x = 188.21

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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.