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Finding the Fourth Proportional to 156.28, 217.19 and 154.66

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Solution

The fourth proportional to 156.28, 217.19 and 154.66 is: 214.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.28 : 217.19 = 154.66 : x
  2. Step 2: Convert to fraction form
    156.28/217.19 = 154.66/x
  3. Step 3: Cross multiply
    156.28x = 217.19 × 154.66
  4. Step 4: Simplify right side
    156.28x = 33,590.61
  5. Step 5: Solve for x
    x = 33,590.61/156.28
  6. Step 6: Final answer
    x = 214.94

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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.