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Finding the Fourth Proportional to 156.78, 234.86 and 79.65

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Solution

The fourth proportional to 156.78, 234.86 and 79.65 is: 119.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.78 : 234.86 = 79.65 : x
  2. Step 2: Convert to fraction form
    156.78/234.86 = 79.65/x
  3. Step 3: Cross multiply
    156.78x = 234.86 × 79.65
  4. Step 4: Simplify right side
    156.78x = 18,706.20
  5. Step 5: Solve for x
    x = 18,706.20/156.78
  6. Step 6: Final answer
    x = 119.31

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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.