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Finding the Fourth Proportional to 156.15, 234.26 and 79.19

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Solution

The fourth proportional to 156.15, 234.26 and 79.19 is: 118.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.15 : 234.26 = 79.19 : x
  2. Step 2: Convert to fraction form
    156.15/234.26 = 79.19/x
  3. Step 3: Cross multiply
    156.15x = 234.26 × 79.19
  4. Step 4: Simplify right side
    156.15x = 18,549.48
  5. Step 5: Solve for x
    x = 18,549.48/156.15
  6. Step 6: Final answer
    x = 118.79

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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.