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Finding the Fourth Proportional to 156.36, 234.60 and 75.21

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Solution

The fourth proportional to 156.36, 234.60 and 75.21 is: 112.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.36 : 234.60 = 75.21 : x
  2. Step 2: Convert to fraction form
    156.36/234.60 = 75.21/x
  3. Step 3: Cross multiply
    156.36x = 234.60 × 75.21
  4. Step 4: Simplify right side
    156.36x = 17,644.42
  5. Step 5: Solve for x
    x = 17,644.42/156.36
  6. Step 6: Final answer
    x = 112.84

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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.