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Finding the Fourth Proportional to 156.18, 234.54 and 84.09

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Solution

The fourth proportional to 156.18, 234.54 and 84.09 is: 126.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.18 : 234.54 = 84.09 : x
  2. Step 2: Convert to fraction form
    156.18/234.54 = 84.09/x
  3. Step 3: Cross multiply
    156.18x = 234.54 × 84.09
  4. Step 4: Simplify right side
    156.18x = 19,722.47
  5. Step 5: Solve for x
    x = 19,722.47/156.18
  6. Step 6: Final answer
    x = 126.28

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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.