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Finding the Fourth Proportional to 273.65, 410.54 and 81.28

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Solution

The fourth proportional to 273.65, 410.54 and 81.28 is: 121.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.65 : 410.54 = 81.28 : x
  2. Step 2: Convert to fraction form
    273.65/410.54 = 81.28/x
  3. Step 3: Cross multiply
    273.65x = 410.54 × 81.28
  4. Step 4: Simplify right side
    273.65x = 33,366.23
  5. Step 5: Solve for x
    x = 33,366.23/273.65
  6. Step 6: Final answer
    x = 121.93

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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.