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Finding the Fourth Proportional to 94.80, 142.11 and 51.43

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Solution

The fourth proportional to 94.80, 142.11 and 51.43 is: 77.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.80 : 142.11 = 51.43 : x
  2. Step 2: Convert to fraction form
    94.80/142.11 = 51.43/x
  3. Step 3: Cross multiply
    94.80x = 142.11 × 51.43
  4. Step 4: Simplify right side
    94.80x = 7,308.23
  5. Step 5: Solve for x
    x = 7,308.23/94.80
  6. Step 6: Final answer
    x = 77.09

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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.