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Finding the Fourth Proportional to 141.72, 212.31 and 76.64

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Solution

The fourth proportional to 141.72, 212.31 and 76.64 is: 114.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.72 : 212.31 = 76.64 : x
  2. Step 2: Convert to fraction form
    141.72/212.31 = 76.64/x
  3. Step 3: Cross multiply
    141.72x = 212.31 × 76.64
  4. Step 4: Simplify right side
    141.72x = 16,270.38
  5. Step 5: Solve for x
    x = 16,270.38/141.72
  6. Step 6: Final answer
    x = 114.81

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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.