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Finding the Fourth Proportional to 272.45, 408.70 and 87.36

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Solution

The fourth proportional to 272.45, 408.70 and 87.36 is: 131.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.45 : 408.70 = 87.36 : x
  2. Step 2: Convert to fraction form
    272.45/408.70 = 87.36/x
  3. Step 3: Cross multiply
    272.45x = 408.70 × 87.36
  4. Step 4: Simplify right side
    272.45x = 35,704.03
  5. Step 5: Solve for x
    x = 35,704.03/272.45
  6. Step 6: Final answer
    x = 131.05

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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.