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Finding the Fourth Proportional to 156.32, 234.68 and 75.20

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Solution

The fourth proportional to 156.32, 234.68 and 75.20 is: 112.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.32 : 234.68 = 75.20 : x
  2. Step 2: Convert to fraction form
    156.32/234.68 = 75.20/x
  3. Step 3: Cross multiply
    156.32x = 234.68 × 75.20
  4. Step 4: Simplify right side
    156.32x = 17,647.94
  5. Step 5: Solve for x
    x = 17,647.94/156.32
  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.