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Finding the Fourth Proportional to 231.20, 346.90 and 109.40

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Solution

The fourth proportional to 231.20, 346.90 and 109.40 is: 164.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.20 : 346.90 = 109.40 : x
  2. Step 2: Convert to fraction form
    231.20/346.90 = 109.40/x
  3. Step 3: Cross multiply
    231.20x = 346.90 × 109.40
  4. Step 4: Simplify right side
    231.20x = 37,950.86
  5. Step 5: Solve for x
    x = 37,950.86/231.20
  6. Step 6: Final answer
    x = 164.15

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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.