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Finding the Fourth Proportional to 272.88, 376.56 and 156.40

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Solution

The fourth proportional to 272.88, 376.56 and 156.40 is: 215.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.88 : 376.56 = 156.40 : x
  2. Step 2: Convert to fraction form
    272.88/376.56 = 156.40/x
  3. Step 3: Cross multiply
    272.88x = 376.56 × 156.40
  4. Step 4: Simplify right side
    272.88x = 58,893.98
  5. Step 5: Solve for x
    x = 58,893.98/272.88
  6. Step 6: Final answer
    x = 215.82

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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.