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Finding the Fourth Proportional to 188.85, 260.51 and 115.21

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Solution

The fourth proportional to 188.85, 260.51 and 115.21 is: 158.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.85 : 260.51 = 115.21 : x
  2. Step 2: Convert to fraction form
    188.85/260.51 = 115.21/x
  3. Step 3: Cross multiply
    188.85x = 260.51 × 115.21
  4. Step 4: Simplify right side
    188.85x = 30,013.36
  5. Step 5: Solve for x
    x = 30,013.36/188.85
  6. Step 6: Final answer
    x = 158.93

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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.