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Finding the Fourth Proportional to 156.41, 217.28 and 154.97

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Solution

The fourth proportional to 156.41, 217.28 and 154.97 is: 215.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.41 : 217.28 = 154.97 : x
  2. Step 2: Convert to fraction form
    156.41/217.28 = 154.97/x
  3. Step 3: Cross multiply
    156.41x = 217.28 × 154.97
  4. Step 4: Simplify right side
    156.41x = 33,671.88
  5. Step 5: Solve for x
    x = 33,671.88/156.41
  6. Step 6: Final answer
    x = 215.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.