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Finding the Fourth Proportional to 231.30, 346.93 and 77.22

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Solution

The fourth proportional to 231.30, 346.93 and 77.22 is: 115.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.30 : 346.93 = 77.22 : x
  2. Step 2: Convert to fraction form
    231.30/346.93 = 77.22/x
  3. Step 3: Cross multiply
    231.30x = 346.93 × 77.22
  4. Step 4: Simplify right side
    231.30x = 26,789.74
  5. Step 5: Solve for x
    x = 26,789.74/231.30
  6. Step 6: Final answer
    x = 115.82

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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.