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Finding the Fourth Proportional to 156.45, 234.72 and 75.24

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Solution

The fourth proportional to 156.45, 234.72 and 75.24 is: 112.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.45 : 234.72 = 75.24 : x
  2. Step 2: Convert to fraction form
    156.45/234.72 = 75.24/x
  3. Step 3: Cross multiply
    156.45x = 234.72 × 75.24
  4. Step 4: Simplify right side
    156.45x = 17,660.33
  5. Step 5: Solve for x
    x = 17,660.33/156.45
  6. Step 6: Final answer
    x = 112.88

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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.