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Finding the Fourth Proportional to 82.37, 113.71 and 54.78

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Solution

The fourth proportional to 82.37, 113.71 and 54.78 is: 75.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.37 : 113.71 = 54.78 : x
  2. Step 2: Convert to fraction form
    82.37/113.71 = 54.78/x
  3. Step 3: Cross multiply
    82.37x = 113.71 × 54.78
  4. Step 4: Simplify right side
    82.37x = 6,229.03
  5. Step 5: Solve for x
    x = 6,229.03/82.37
  6. Step 6: Final answer
    x = 75.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.