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Finding the Fourth Proportional to 231.22, 346.38 and 139.87

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Solution

The fourth proportional to 231.22, 346.38 and 139.87 is: 209.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.22 : 346.38 = 139.87 : x
  2. Step 2: Convert to fraction form
    231.22/346.38 = 139.87/x
  3. Step 3: Cross multiply
    231.22x = 346.38 × 139.87
  4. Step 4: Simplify right side
    231.22x = 48,448.17
  5. Step 5: Solve for x
    x = 48,448.17/231.22
  6. Step 6: Final answer
    x = 209.53

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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.