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Finding the Fourth Proportional to 260.05, 390.09 and 115.77

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Solution

The fourth proportional to 260.05, 390.09 and 115.77 is: 173.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.05 : 390.09 = 115.77 : x
  2. Step 2: Convert to fraction form
    260.05/390.09 = 115.77/x
  3. Step 3: Cross multiply
    260.05x = 390.09 × 115.77
  4. Step 4: Simplify right side
    260.05x = 45,160.72
  5. Step 5: Solve for x
    x = 45,160.72/260.05
  6. Step 6: Final answer
    x = 173.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.