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Finding the Fourth Proportional to 189.58, 261.38 and 154.19

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Solution

The fourth proportional to 189.58, 261.38 and 154.19 is: 212.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.58 : 261.38 = 154.19 : x
  2. Step 2: Convert to fraction form
    189.58/261.38 = 154.19/x
  3. Step 3: Cross multiply
    189.58x = 261.38 × 154.19
  4. Step 4: Simplify right side
    189.58x = 40,301.99
  5. Step 5: Solve for x
    x = 40,301.99/189.58
  6. Step 6: Final answer
    x = 212.59

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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.