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Finding the Fourth Proportional to 156.42, 234.59 and 79.40

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Solution

The fourth proportional to 156.42, 234.59 and 79.40 is: 119.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.42 : 234.59 = 79.40 : x
  2. Step 2: Convert to fraction form
    156.42/234.59 = 79.40/x
  3. Step 3: Cross multiply
    156.42x = 234.59 × 79.40
  4. Step 4: Simplify right side
    156.42x = 18,624.88
  5. Step 5: Solve for x
    x = 18,624.88/156.42
  6. Step 6: Final answer
    x = 119.07

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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.