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Finding the Fourth Proportional to 84.03, 125.28 and 81.89

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Solution

The fourth proportional to 84.03, 125.28 and 81.89 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.03 : 125.28 = 81.89 : x
  2. Step 2: Convert to fraction form
    84.03/125.28 = 81.89/x
  3. Step 3: Cross multiply
    84.03x = 125.28 × 81.89
  4. Step 4: Simplify right side
    84.03x = 10,259.18
  5. Step 5: Solve for x
    x = 10,259.18/84.03
  6. Step 6: Final answer
    x = 122.09

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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.