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Finding the Fourth Proportional to 156.39, 234.65 and 120.61

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Solution

The fourth proportional to 156.39, 234.65 and 120.61 is: 180.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.39 : 234.65 = 120.61 : x
  2. Step 2: Convert to fraction form
    156.39/234.65 = 120.61/x
  3. Step 3: Cross multiply
    156.39x = 234.65 × 120.61
  4. Step 4: Simplify right side
    156.39x = 28,301.14
  5. Step 5: Solve for x
    x = 28,301.14/156.39
  6. Step 6: Final answer
    x = 180.97

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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.