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Finding the Fourth Proportional to 138.15, 190.64 and 79.93

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Solution

The fourth proportional to 138.15, 190.64 and 79.93 is: 110.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.15 : 190.64 = 79.93 : x
  2. Step 2: Convert to fraction form
    138.15/190.64 = 79.93/x
  3. Step 3: Cross multiply
    138.15x = 190.64 × 79.93
  4. Step 4: Simplify right side
    138.15x = 15,237.58
  5. Step 5: Solve for x
    x = 15,237.58/138.15
  6. Step 6: Final answer
    x = 110.30

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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.