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Finding the Fourth Proportional to 231.48, 346.52 and 139.89

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Solution

The fourth proportional to 231.48, 346.52 and 139.89 is: 209.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.48 : 346.52 = 139.89 : x
  2. Step 2: Convert to fraction form
    231.48/346.52 = 139.89/x
  3. Step 3: Cross multiply
    231.48x = 346.52 × 139.89
  4. Step 4: Simplify right side
    231.48x = 48,475.90
  5. Step 5: Solve for x
    x = 48,475.90/231.48
  6. Step 6: Final answer
    x = 209.42

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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.