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Finding the Fourth Proportional to 272.11, 375.49 and 155.65

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Solution

The fourth proportional to 272.11, 375.49 and 155.65 is: 214.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.11 : 375.49 = 155.65 : x
  2. Step 2: Convert to fraction form
    272.11/375.49 = 155.65/x
  3. Step 3: Cross multiply
    272.11x = 375.49 × 155.65
  4. Step 4: Simplify right side
    272.11x = 58,445.02
  5. Step 5: Solve for x
    x = 58,445.02/272.11
  6. Step 6: Final answer
    x = 214.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.