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Finding the Fourth Proportional to 260.81, 390.96 and 106.71

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Solution

The fourth proportional to 260.81, 390.96 and 106.71 is: 159.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.81 : 390.96 = 106.71 : x
  2. Step 2: Convert to fraction form
    260.81/390.96 = 106.71/x
  3. Step 3: Cross multiply
    260.81x = 390.96 × 106.71
  4. Step 4: Simplify right side
    260.81x = 41,719.34
  5. Step 5: Solve for x
    x = 41,719.34/260.81
  6. Step 6: Final answer
    x = 159.96

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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.