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Finding the Fourth Proportional to 141.28, 211.47 and 115.54

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Solution

The fourth proportional to 141.28, 211.47 and 115.54 is: 172.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.28 : 211.47 = 115.54 : x
  2. Step 2: Convert to fraction form
    141.28/211.47 = 115.54/x
  3. Step 3: Cross multiply
    141.28x = 211.47 × 115.54
  4. Step 4: Simplify right side
    141.28x = 24,433.24
  5. Step 5: Solve for x
    x = 24,433.24/141.28
  6. Step 6: Final answer
    x = 172.94

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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.