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Finding the Fourth Proportional to 141.45, 212.18 and 45.27

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Solution

The fourth proportional to 141.45, 212.18 and 45.27 is: 67.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.45 : 212.18 = 45.27 : x
  2. Step 2: Convert to fraction form
    141.45/212.18 = 45.27/x
  3. Step 3: Cross multiply
    141.45x = 212.18 × 45.27
  4. Step 4: Simplify right side
    141.45x = 9,604.59
  5. Step 5: Solve for x
    x = 9,604.59/141.45
  6. Step 6: Final answer
    x = 67.90

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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.