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Finding the Fourth Proportional to 156.12, 214.26 and 139.44

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Solution

The fourth proportional to 156.12, 214.26 and 139.44 is: 191.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.12 : 214.26 = 139.44 : x
  2. Step 2: Convert to fraction form
    156.12/214.26 = 139.44/x
  3. Step 3: Cross multiply
    156.12x = 214.26 × 139.44
  4. Step 4: Simplify right side
    156.12x = 29,876.41
  5. Step 5: Solve for x
    x = 29,876.41/156.12
  6. Step 6: Final answer
    x = 191.37

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.