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Finding the Fourth Proportional to 272.74, 408.96 and 90.04

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Solution

The fourth proportional to 272.74, 408.96 and 90.04 is: 135.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.74 : 408.96 = 90.04 : x
  2. Step 2: Convert to fraction form
    272.74/408.96 = 90.04/x
  3. Step 3: Cross multiply
    272.74x = 408.96 × 90.04
  4. Step 4: Simplify right side
    272.74x = 36,822.76
  5. Step 5: Solve for x
    x = 36,822.76/272.74
  6. Step 6: Final answer
    x = 135.01

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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.