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Finding the Fourth Proportional to 156.63, 217.64 and 154.94

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Solution

The fourth proportional to 156.63, 217.64 and 154.94 is: 215.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.63 : 217.64 = 154.94 : x
  2. Step 2: Convert to fraction form
    156.63/217.64 = 154.94/x
  3. Step 3: Cross multiply
    156.63x = 217.64 × 154.94
  4. Step 4: Simplify right side
    156.63x = 33,721.14
  5. Step 5: Solve for x
    x = 33,721.14/156.63
  6. Step 6: Final answer
    x = 215.29

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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.