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Finding the Fourth Proportional to 272.19, 406.65 and 211.17

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Solution

The fourth proportional to 272.19, 406.65 and 211.17 is: 315.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.19 : 406.65 = 211.17 : x
  2. Step 2: Convert to fraction form
    272.19/406.65 = 211.17/x
  3. Step 3: Cross multiply
    272.19x = 406.65 × 211.17
  4. Step 4: Simplify right side
    272.19x = 85,872.28
  5. Step 5: Solve for x
    x = 85,872.28/272.19
  6. Step 6: Final answer
    x = 315.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.