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Finding the Fourth Proportional to 231.86, 319.92 and 138.58

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Solution

The fourth proportional to 231.86, 319.92 and 138.58 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.86 : 319.92 = 138.58 : x
  2. Step 2: Convert to fraction form
    231.86/319.92 = 138.58/x
  3. Step 3: Cross multiply
    231.86x = 319.92 × 138.58
  4. Step 4: Simplify right side
    231.86x = 44,334.51
  5. Step 5: Solve for x
    x = 44,334.51/231.86
  6. Step 6: Final answer
    x = 191.21

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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.