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Finding the Fourth Proportional to 260.22, 390.47 and 115.91

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Solution

The fourth proportional to 260.22, 390.47 and 115.91 is: 173.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.22 : 390.47 = 115.91 : x
  2. Step 2: Convert to fraction form
    260.22/390.47 = 115.91/x
  3. Step 3: Cross multiply
    260.22x = 390.47 × 115.91
  4. Step 4: Simplify right side
    260.22x = 45,256.85
  5. Step 5: Solve for x
    x = 45,256.85/260.22
  6. Step 6: Final answer
    x = 173.92

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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.