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Finding the Fourth Proportional to 260.41, 390.58 and 77.79

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Solution

The fourth proportional to 260.41, 390.58 and 77.79 is: 116.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.41 : 390.58 = 77.79 : x
  2. Step 2: Convert to fraction form
    260.41/390.58 = 77.79/x
  3. Step 3: Cross multiply
    260.41x = 390.58 × 77.79
  4. Step 4: Simplify right side
    260.41x = 30,381.85
  5. Step 5: Solve for x
    x = 30,381.85/260.41
  6. Step 6: Final answer
    x = 116.67

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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.