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Finding the Fourth Proportional to 156.11, 214.81 and 119.21

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Solution

The fourth proportional to 156.11, 214.81 and 119.21 is: 164.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.11 : 214.81 = 119.21 : x
  2. Step 2: Convert to fraction form
    156.11/214.81 = 119.21/x
  3. Step 3: Cross multiply
    156.11x = 214.81 × 119.21
  4. Step 4: Simplify right side
    156.11x = 25,606.13
  5. Step 5: Solve for x
    x = 25,606.13/156.11
  6. Step 6: Final answer
    x = 164.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.