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Finding the Fourth Proportional to 141.63, 212.72 and 80.88

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Solution

The fourth proportional to 141.63, 212.72 and 80.88 is: 121.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.63 : 212.72 = 80.88 : x
  2. Step 2: Convert to fraction form
    141.63/212.72 = 80.88/x
  3. Step 3: Cross multiply
    141.63x = 212.72 × 80.88
  4. Step 4: Simplify right side
    141.63x = 17,204.39
  5. Step 5: Solve for x
    x = 17,204.39/141.63
  6. Step 6: Final answer
    x = 121.47

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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.