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Finding the Fourth Proportional to 138.54, 191.18 and 76.36

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Solution

The fourth proportional to 138.54, 191.18 and 76.36 is: 105.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.54 : 191.18 = 76.36 : x
  2. Step 2: Convert to fraction form
    138.54/191.18 = 76.36/x
  3. Step 3: Cross multiply
    138.54x = 191.18 × 76.36
  4. Step 4: Simplify right side
    138.54x = 14,597.34
  5. Step 5: Solve for x
    x = 14,597.34/138.54
  6. Step 6: Final answer
    x = 105.37

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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.