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Finding the Fourth Proportional to 272.78, 376.42 and 156.34

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Solution

The fourth proportional to 272.78, 376.42 and 156.34 is: 215.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.78 : 376.42 = 156.34 : x
  2. Step 2: Convert to fraction form
    272.78/376.42 = 156.34/x
  3. Step 3: Cross multiply
    272.78x = 376.42 × 156.34
  4. Step 4: Simplify right side
    272.78x = 58,849.50
  5. Step 5: Solve for x
    x = 58,849.50/272.78
  6. Step 6: Final answer
    x = 215.74

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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.