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Finding the Fourth Proportional to 272.80, 376.40 and 154.76

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Solution

The fourth proportional to 272.80, 376.40 and 154.76 is: 213.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.80 : 376.40 = 154.76 : x
  2. Step 2: Convert to fraction form
    272.80/376.40 = 154.76/x
  3. Step 3: Cross multiply
    272.80x = 376.40 × 154.76
  4. Step 4: Simplify right side
    272.80x = 58,251.66
  5. Step 5: Solve for x
    x = 58,251.66/272.80
  6. Step 6: Final answer
    x = 213.53

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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.