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Finding the Fourth Proportional to 82.56, 113.93 and 49.81

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Solution

The fourth proportional to 82.56, 113.93 and 49.81 is: 68.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.56 : 113.93 = 49.81 : x
  2. Step 2: Convert to fraction form
    82.56/113.93 = 49.81/x
  3. Step 3: Cross multiply
    82.56x = 113.93 × 49.81
  4. Step 4: Simplify right side
    82.56x = 5,674.60
  5. Step 5: Solve for x
    x = 5,674.60/82.56
  6. Step 6: Final answer
    x = 68.74

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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.