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Finding the Fourth Proportional to 92.93, 138.69 and 79.43

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Solution

The fourth proportional to 92.93, 138.69 and 79.43 is: 118.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.93 : 138.69 = 79.43 : x
  2. Step 2: Convert to fraction form
    92.93/138.69 = 79.43/x
  3. Step 3: Cross multiply
    92.93x = 138.69 × 79.43
  4. Step 4: Simplify right side
    92.93x = 11,015.45
  5. Step 5: Solve for x
    x = 11,015.45/92.93
  6. Step 6: Final answer
    x = 118.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.