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Finding the Fourth Proportional to 189.13, 260.97 and 115.45

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Solution

The fourth proportional to 189.13, 260.97 and 115.45 is: 159.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.13 : 260.97 = 115.45 : x
  2. Step 2: Convert to fraction form
    189.13/260.97 = 115.45/x
  3. Step 3: Cross multiply
    189.13x = 260.97 × 115.45
  4. Step 4: Simplify right side
    189.13x = 30,128.99
  5. Step 5: Solve for x
    x = 30,128.99/189.13
  6. Step 6: Final answer
    x = 159.30

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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.