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Finding the Fourth Proportional to 231.29, 346.91 and 77.21

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Solution

The fourth proportional to 231.29, 346.91 and 77.21 is: 115.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.29 : 346.91 = 77.21 : x
  2. Step 2: Convert to fraction form
    231.29/346.91 = 77.21/x
  3. Step 3: Cross multiply
    231.29x = 346.91 × 77.21
  4. Step 4: Simplify right side
    231.29x = 26,785.40
  5. Step 5: Solve for x
    x = 26,785.40/231.29
  6. Step 6: Final answer
    x = 115.81

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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.