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Finding the Fourth Proportional to 156.62, 216.06 and 121.88

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Solution

The fourth proportional to 156.62, 216.06 and 121.88 is: 168.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.62 : 216.06 = 121.88 : x
  2. Step 2: Convert to fraction form
    156.62/216.06 = 121.88/x
  3. Step 3: Cross multiply
    156.62x = 216.06 × 121.88
  4. Step 4: Simplify right side
    156.62x = 26,333.39
  5. Step 5: Solve for x
    x = 26,333.39/156.62
  6. Step 6: Final answer
    x = 168.14

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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.