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Finding the Fourth Proportional to 189.69, 261.77 and 123.31

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Solution

The fourth proportional to 189.69, 261.77 and 123.31 is: 170.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.69 : 261.77 = 123.31 : x
  2. Step 2: Convert to fraction form
    189.69/261.77 = 123.31/x
  3. Step 3: Cross multiply
    189.69x = 261.77 × 123.31
  4. Step 4: Simplify right side
    189.69x = 32,278.86
  5. Step 5: Solve for x
    x = 32,278.86/189.69
  6. Step 6: Final answer
    x = 170.17

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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.