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Finding the Fourth Proportional to 188.96, 260.78 and 115.27

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Solution

The fourth proportional to 188.96, 260.78 and 115.27 is: 159.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.96 : 260.78 = 115.27 : x
  2. Step 2: Convert to fraction form
    188.96/260.78 = 115.27/x
  3. Step 3: Cross multiply
    188.96x = 260.78 × 115.27
  4. Step 4: Simplify right side
    188.96x = 30,058.88
  5. Step 5: Solve for x
    x = 30,058.88/188.96
  6. Step 6: Final answer
    x = 159.08

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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.