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Finding the Fourth Proportional to 156.75, 234.91 and 118.20

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Solution

The fourth proportional to 156.75, 234.91 and 118.20 is: 177.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.75 : 234.91 = 118.20 : x
  2. Step 2: Convert to fraction form
    156.75/234.91 = 118.20/x
  3. Step 3: Cross multiply
    156.75x = 234.91 × 118.20
  4. Step 4: Simplify right side
    156.75x = 27,764.74
  5. Step 5: Solve for x
    x = 27,764.74/156.75
  6. Step 6: Final answer
    x = 177.13

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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.