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Finding the Fourth Proportional to 138.93, 191.67 and 86.46

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Solution

The fourth proportional to 138.93, 191.67 and 86.46 is: 119.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.93 : 191.67 = 86.46 : x
  2. Step 2: Convert to fraction form
    138.93/191.67 = 86.46/x
  3. Step 3: Cross multiply
    138.93x = 191.67 × 86.46
  4. Step 4: Simplify right side
    138.93x = 16,571.79
  5. Step 5: Solve for x
    x = 16,571.79/138.93
  6. Step 6: Final answer
    x = 119.28

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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.