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Finding the Fourth Proportional to 84.06, 125.01 and 81.36

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Solution

The fourth proportional to 84.06, 125.01 and 81.36 is: 120.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.06 : 125.01 = 81.36 : x
  2. Step 2: Convert to fraction form
    84.06/125.01 = 81.36/x
  3. Step 3: Cross multiply
    84.06x = 125.01 × 81.36
  4. Step 4: Simplify right side
    84.06x = 10,170.81
  5. Step 5: Solve for x
    x = 10,170.81/84.06
  6. Step 6: Final answer
    x = 120.99

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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.