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Finding the Fourth Proportional to 231.87, 319.92 and 138.63

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Solution

The fourth proportional to 231.87, 319.92 and 138.63 is: 191.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.87 : 319.92 = 138.63 : x
  2. Step 2: Convert to fraction form
    231.87/319.92 = 138.63/x
  3. Step 3: Cross multiply
    231.87x = 319.92 × 138.63
  4. Step 4: Simplify right side
    231.87x = 44,350.51
  5. Step 5: Solve for x
    x = 44,350.51/231.87
  6. Step 6: Final answer
    x = 191.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.