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Finding the Fourth Proportional to 272.18, 408.21 and 156.75

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Solution

The fourth proportional to 272.18, 408.21 and 156.75 is: 235.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.18 : 408.21 = 156.75 : x
  2. Step 2: Convert to fraction form
    272.18/408.21 = 156.75/x
  3. Step 3: Cross multiply
    272.18x = 408.21 × 156.75
  4. Step 4: Simplify right side
    272.18x = 63,986.92
  5. Step 5: Solve for x
    x = 63,986.92/272.18
  6. Step 6: Final answer
    x = 235.09

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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.