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Finding the Fourth Proportional to 77.81, 117.37 and 75.38

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Solution

The fourth proportional to 77.81, 117.37 and 75.38 is: 113.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.81 : 117.37 = 75.38 : x
  2. Step 2: Convert to fraction form
    77.81/117.37 = 75.38/x
  3. Step 3: Cross multiply
    77.81x = 117.37 × 75.38
  4. Step 4: Simplify right side
    77.81x = 8,847.35
  5. Step 5: Solve for x
    x = 8,847.35/77.81
  6. Step 6: Final answer
    x = 113.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.