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Finding the Fourth Proportional to 231.93, 320.07 and 138.69

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Solution

The fourth proportional to 231.93, 320.07 and 138.69 is: 191.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.93 : 320.07 = 138.69 : x
  2. Step 2: Convert to fraction form
    231.93/320.07 = 138.69/x
  3. Step 3: Cross multiply
    231.93x = 320.07 × 138.69
  4. Step 4: Simplify right side
    231.93x = 44,388.21
  5. Step 5: Solve for x
    x = 44,388.21/231.93
  6. Step 6: Final answer
    x = 191.39

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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.