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Finding the Fourth Proportional to 273.75, 410.70 and 81.38

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Solution

The fourth proportional to 273.75, 410.70 and 81.38 is: 122.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.75 : 410.70 = 81.38 : x
  2. Step 2: Convert to fraction form
    273.75/410.70 = 81.38/x
  3. Step 3: Cross multiply
    273.75x = 410.70 × 81.38
  4. Step 4: Simplify right side
    273.75x = 33,420.71
  5. Step 5: Solve for x
    x = 33,420.71/273.75
  6. Step 6: Final answer
    x = 122.08

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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.