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Finding the Fourth Proportional to 272.44, 408.68 and 87.40

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Solution

The fourth proportional to 272.44, 408.68 and 87.40 is: 131.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.44 : 408.68 = 87.40 : x
  2. Step 2: Convert to fraction form
    272.44/408.68 = 87.40/x
  3. Step 3: Cross multiply
    272.44x = 408.68 × 87.40
  4. Step 4: Simplify right side
    272.44x = 35,718.63
  5. Step 5: Solve for x
    x = 35,718.63/272.44
  6. Step 6: Final answer
    x = 131.11

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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.