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Finding the Fourth Proportional to 138.83, 191.58 and 76.66

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Solution

The fourth proportional to 138.83, 191.58 and 76.66 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.83 : 191.58 = 76.66 : x
  2. Step 2: Convert to fraction form
    138.83/191.58 = 76.66/x
  3. Step 3: Cross multiply
    138.83x = 191.58 × 76.66
  4. Step 4: Simplify right side
    138.83x = 14,685.37
  5. Step 5: Solve for x
    x = 14,685.37/138.83
  6. Step 6: Final answer
    x = 105.78

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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.