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Finding the Fourth Proportional to 260.26, 390.32 and 77.61

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Solution

The fourth proportional to 260.26, 390.32 and 77.61 is: 116.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.26 : 390.32 = 77.61 : x
  2. Step 2: Convert to fraction form
    260.26/390.32 = 77.61/x
  3. Step 3: Cross multiply
    260.26x = 390.32 × 77.61
  4. Step 4: Simplify right side
    260.26x = 30,291.91
  5. Step 5: Solve for x
    x = 30,291.91/260.26
  6. Step 6: Final answer
    x = 116.39

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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.