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Finding the Fourth Proportional to 51.25, 76.91 and 28.43

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Solution

The fourth proportional to 51.25, 76.91 and 28.43 is: 42.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.25 : 76.91 = 28.43 : x
  2. Step 2: Convert to fraction form
    51.25/76.91 = 28.43/x
  3. Step 3: Cross multiply
    51.25x = 76.91 × 28.43
  4. Step 4: Simplify right side
    51.25x = 2,186.55
  5. Step 5: Solve for x
    x = 2,186.55/51.25
  6. Step 6: Final answer
    x = 42.66

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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.