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Finding the Fourth Proportional to 156.57, 234.90 and 129.75

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Solution

The fourth proportional to 156.57, 234.90 and 129.75 is: 194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.57 : 234.90 = 129.75 : x
  2. Step 2: Convert to fraction form
    156.57/234.90 = 129.75/x
  3. Step 3: Cross multiply
    156.57x = 234.90 × 129.75
  4. Step 4: Simplify right side
    156.57x = 30,478.28
  5. Step 5: Solve for x
    x = 30,478.28/156.57
  6. Step 6: Final answer
    x = 194.66

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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.