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Finding the Fourth Proportional to 156.39, 234.78 and 120.34

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Solution

The fourth proportional to 156.39, 234.78 and 120.34 is: 180.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.39 : 234.78 = 120.34 : x
  2. Step 2: Convert to fraction form
    156.39/234.78 = 120.34/x
  3. Step 3: Cross multiply
    156.39x = 234.78 × 120.34
  4. Step 4: Simplify right side
    156.39x = 28,253.43
  5. Step 5: Solve for x
    x = 28,253.43/156.39
  6. Step 6: Final answer
    x = 180.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.