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Finding the Fourth Proportional to 273.46, 409.88 and 90.81

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Solution

The fourth proportional to 273.46, 409.88 and 90.81 is: 136.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.46 : 409.88 = 90.81 : x
  2. Step 2: Convert to fraction form
    273.46/409.88 = 90.81/x
  3. Step 3: Cross multiply
    273.46x = 409.88 × 90.81
  4. Step 4: Simplify right side
    273.46x = 37,221.20
  5. Step 5: Solve for x
    x = 37,221.20/273.46
  6. Step 6: Final answer
    x = 136.11

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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.