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Finding the Fourth Proportional to 51.38, 76.02 and 51.22

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Solution

The fourth proportional to 51.38, 76.02 and 51.22 is: 75.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.38 : 76.02 = 51.22 : x
  2. Step 2: Convert to fraction form
    51.38/76.02 = 51.22/x
  3. Step 3: Cross multiply
    51.38x = 76.02 × 51.22
  4. Step 4: Simplify right side
    51.38x = 3,893.74
  5. Step 5: Solve for x
    x = 3,893.74/51.38
  6. Step 6: Final answer
    x = 75.78

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.