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Finding the Fourth Proportional to 156.46, 216 and 121.41

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Solution

The fourth proportional to 156.46, 216 and 121.41 is: 167.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.46 : 216 = 121.41 : x
  2. Step 2: Convert to fraction form
    156.46/216 = 121.41/x
  3. Step 3: Cross multiply
    156.46x = 216 × 121.41
  4. Step 4: Simplify right side
    156.46x = 26,224.56
  5. Step 5: Solve for x
    x = 26,224.56/156.46
  6. Step 6: Final answer
    x = 167.61

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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.