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Finding the Fourth Proportional to 156.81, 234.84 and 75.39

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Solution

The fourth proportional to 156.81, 234.84 and 75.39 is: 112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.81 : 234.84 = 75.39 : x
  2. Step 2: Convert to fraction form
    156.81/234.84 = 75.39/x
  3. Step 3: Cross multiply
    156.81x = 234.84 × 75.39
  4. Step 4: Simplify right side
    156.81x = 17,704.59
  5. Step 5: Solve for x
    x = 17,704.59/156.81
  6. Step 6: Final answer
    x = 112.90

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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.