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Finding the Fourth Proportional to 141.95, 212.77 and 80.95

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Solution

The fourth proportional to 141.95, 212.77 and 80.95 is: 121.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.95 : 212.77 = 80.95 : x
  2. Step 2: Convert to fraction form
    141.95/212.77 = 80.95/x
  3. Step 3: Cross multiply
    141.95x = 212.77 × 80.95
  4. Step 4: Simplify right side
    141.95x = 17,222.36
  5. Step 5: Solve for x
    x = 17,222.36/141.95
  6. Step 6: Final answer
    x = 121.33

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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.