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Finding the Fourth Proportional to 273.89, 410.91 and 81.51

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Solution

The fourth proportional to 273.89, 410.91 and 81.51 is: 122.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.89 : 410.91 = 81.51 : x
  2. Step 2: Convert to fraction form
    273.89/410.91 = 81.51/x
  3. Step 3: Cross multiply
    273.89x = 410.91 × 81.51
  4. Step 4: Simplify right side
    273.89x = 33,492.87
  5. Step 5: Solve for x
    x = 33,492.87/273.89
  6. Step 6: Final answer
    x = 122.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.