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Finding the Fourth Proportional to 189.21, 261.11 and 111.59

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Solution

The fourth proportional to 189.21, 261.11 and 111.59 is: 153.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.21 : 261.11 = 111.59 : x
  2. Step 2: Convert to fraction form
    189.21/261.11 = 111.59/x
  3. Step 3: Cross multiply
    189.21x = 261.11 × 111.59
  4. Step 4: Simplify right side
    189.21x = 29,136.24
  5. Step 5: Solve for x
    x = 29,136.24/189.21
  6. Step 6: Final answer
    x = 153.99

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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.