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Finding the Fourth Proportional to 84.51, 125.91 and 79.92

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Solution

The fourth proportional to 84.51, 125.91 and 79.92 is: 119.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.51 : 125.91 = 79.92 : x
  2. Step 2: Convert to fraction form
    84.51/125.91 = 79.92/x
  3. Step 3: Cross multiply
    84.51x = 125.91 × 79.92
  4. Step 4: Simplify right side
    84.51x = 10,062.73
  5. Step 5: Solve for x
    x = 10,062.73/84.51
  6. Step 6: Final answer
    x = 119.07

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