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Finding the Fourth Proportional to 91.36, 125.79 and 79.06

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Solution

The fourth proportional to 91.36, 125.79 and 79.06 is: 108.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.36 : 125.79 = 79.06 : x
  2. Step 2: Convert to fraction form
    91.36/125.79 = 79.06/x
  3. Step 3: Cross multiply
    91.36x = 125.79 × 79.06
  4. Step 4: Simplify right side
    91.36x = 9,944.96
  5. Step 5: Solve for x
    x = 9,944.96/91.36
  6. Step 6: Final answer
    x = 108.85

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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.