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Finding the Fourth Proportional to 141.77, 212.15 and 80.75

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Solution

The fourth proportional to 141.77, 212.15 and 80.75 is: 120.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.77 : 212.15 = 80.75 : x
  2. Step 2: Convert to fraction form
    141.77/212.15 = 80.75/x
  3. Step 3: Cross multiply
    141.77x = 212.15 × 80.75
  4. Step 4: Simplify right side
    141.77x = 17,131.84
  5. Step 5: Solve for x
    x = 17,131.84/141.77
  6. Step 6: Final answer
    x = 120.84

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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.