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Finding the Fourth Proportional to 231.18, 346.78 and 68.88

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Solution

The fourth proportional to 231.18, 346.78 and 68.88 is: 103.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.18 : 346.78 = 68.88 : x
  2. Step 2: Convert to fraction form
    231.18/346.78 = 68.88/x
  3. Step 3: Cross multiply
    231.18x = 346.78 × 68.88
  4. Step 4: Simplify right side
    231.18x = 23,886.21
  5. Step 5: Solve for x
    x = 23,886.21/231.18
  6. Step 6: Final answer
    x = 103.32

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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.